312
Chicago, Illinois
Illinois · Central (UTC-6) · — · 38 cities · Overlay: 872
State
Major City
Chicago
Time Zone
Central (UTC-6)
Current Local Time
—
Overlay Code
Cities Served
38
Cities Served by Area Code 312 (38 cities)
Albany Park+3 codesAustin+3 codesAvondale+3 codesBerwyn+4 codesBeverly+3 codesBridgeport+3 codesCalumet City+4 codesChicago+4 codesChinatown+3 codesCicero+4 codesCountry Club Hills+4 codesDolton+4 codesEdison Park+3 codesEnglewood+3 codesFlossmoor+4 codesGarfield Park+3 codesHarvey+4 codesHomewood+4 codesHumboldt Park+3 codesHyde Park+3 codesIrving Park+3 codesLakeview+3 codesLansing+4 codesLincoln Park+3 codesLogan Square+3 codesLoop+3 codesMatteson+4 codesMount Greenwood+3 codesOak Lawn+4 codesOak Park+4 codesOrland Park+4 codesPilsen+3 codesRiver North+3 codesRogers Park+3 codesSouth Holland+4 codesTinley Park+4 codesUptown+3 codesWicker Park+3 codes
Additional Details
Established
1947
Type
Original (1947)
Active Prefixes
799
Wireless Lines
35%
About Area Code 312
Area code 312 is one of the original 86 area codes established in 1947 when AT&T and the Bell System created the North American Numbering Plan. It has served the Chicago area for over 75 years. This area code shares its territory with overlay code 872, meaning callers must dial all 10 digits for local calls. The area is in the Central time zone. It covers 38 cities and communities including Albany Park, Austin, Avondale, Berwyn, Beverly and 33 more.
Phone Number Prefixes in Area Code 312
799 active NXX prefixes — 35% wireless, 65% landline. Each prefix (NXX) represents up to 10,000 phone numbers.
AT&T (IL Bell) 334 (42%)AT&T Mobility 82 (10%)T-Mobile 59 (7%)Verizon Wireless 54 (7%)MCI/Verizon 41 (5%)
| Prefix | Carrier | Type | Rate Center |
|---|---|---|---|
| 312-200 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-201 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-202 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-203 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-204 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-205 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-206 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-207 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-208 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-209 | Verizon Wireless | Wireless | Northbrook |
| 312-210 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-211 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-212 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-213 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-214 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-215 | AT&T Mobility | Wireless | Wheeling |
| 312-216 | First Communications | Landline | Chicgozn01 |
| 312-217 | T-Mobile | Wireless | Chicgozn01 |
| 312-218 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-219 | Bandwidth.com | Landline | Chicgozn01 |
| 312-220 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-221 | T-Mobile | Wireless | Chicgozn01 |
| 312-222 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-223 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-224 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-225 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-226 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-227 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-228 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-229 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-230 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-231 | AT&T Mobility | Wireless | Roselle |
| 312-232 | American Messaging Services | Landline | Chicgozn01 |
| 312-233 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-234 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-235 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-236 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-237 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-238 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-239 | AT&T | Landline | Chicgozn01 |
| 312-240 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-241 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-242 | Teleport Communications America | Landline | Chicgozn01 |
| 312-243 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-244 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-245 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-246 | AT&T Mobility | Wireless | Wheeling |
| 312-247 | First Communications | Landline | Chicgozn01 |
| 312-248 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-249 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-250 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-251 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-252 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-253 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-254 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-255 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-256 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-257 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-258 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-259 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-260 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-261 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-262 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-263 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-264 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-265 | Access One | Landline | Chicgozn01 |
| 312-266 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-267 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-268 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-269 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-270 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-271 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-272 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-273 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-274 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-275 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-276 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-277 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-278 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-279 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-280 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-281 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-282 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-283 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-284 | Xo Illinois | Landline | Chicgozn01 |
| 312-285 | T-Mobile | Wireless | Chicgozn01 |
| 312-286 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-287 | T-Mobile | Wireless | Chicgozn07 |
| 312-288 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-289 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-290 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-291 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-292 | Bandwidth.com | Landline | Chicgozn01 |
| 312-293 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-294 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-295 | Usa Mobility Wireless | Wireless | La Grange |
| 312-296 | T-Mobile | Wireless | Chicgozn01 |
| 312-297 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-298 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-299 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-300 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-301 | AT&T Mobility | Wireless | Hinsdale |
| 312-302 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-303 | AT&T Mobility | Wireless | Wheeling |
| 312-304 | AT&T Mobility | Wireless | Hinsdale |
| 312-305 | Verizon Wireless | Wireless | Northbrook |
| 312-306 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-307 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-308 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-309 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-310 | Verizon Wireless | Wireless | Northbrook |
| 312-311 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-312 | Onvoy | Landline | Chicgozn01 |
| 312-313 | Onvoy | Landline | Chicgozn01 |
| 312-314 | AT&T Mobility | Wireless | Hinsdale |
| 312-315 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-316 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-317 | AT&T Mobility | Wireless | Wheeling |
| 312-318 | Verizon Wireless | Wireless | La Grange |
| 312-319 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-320 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-321 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-322 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-323 | American Messaging Services | Landline | Chicgozn01 |
| 312-324 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-325 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-326 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-327 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-328 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-329 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-330 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-331 | AT&T Mobility | Wireless | Wheeling |
| 312-332 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-333 | American Messaging Services | Landline | Chicgozn01 |
| 312-334 | First Communications | Landline | Chicgozn01 |
| 312-335 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-336 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-337 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-338 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-339 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-340 | T-Mobile | Wireless | Chicgozn01 |
| 312-341 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-342 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-343 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-344 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-345 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-346 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-347 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-348 | Onvoy | Landline | Chicgozn01 |
| 312-349 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-350 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-351 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-352 | AT&T Mobility | Wireless | Hinsdale |
| 312-353 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-354 | AT&T Mobility | Wireless | Roselle |
| 312-355 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-356 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-357 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-358 | T-Mobile | Wireless | Chicgozn01 |
| 312-359 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-360 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-361 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-362 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-363 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-364 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-365 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-366 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-367 | Usa Mobility Wireless | Wireless | La Grange |
| 312-368 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-369 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-370 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-371 | T-Mobile | Wireless | Chicgozn01 |
| 312-372 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-373 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-374 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-375 | T-Mobile | Wireless | Chicgozn01 |
| 312-376 | Onvoy | Landline | Chicgozn01 |
| 312-377 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-378 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-379 | Paetec Itel | Landline | Chicgozn01 |
| 312-380 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-381 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-382 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-383 | Teleport Communications America | Landline | Chicgozn01 |
| 312-384 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-385 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-386 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-387 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-388 | T-Mobile | Wireless | Chicgozn01 |
| 312-389 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-390 | American Messaging Services | Landline | Chicgozn01 |
| 312-391 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-392 | Onvoy | Landline | Chicgozn01 |
| 312-393 | American Messaging Services | Landline | Chicgozn01 |
| 312-394 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-395 | Teleport Communications America | Landline | Chicgozn01 |
| 312-396 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-397 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-398 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-399 | T-Mobile | Wireless | Chicgozn01 |
| 312-400 | American Messaging Services | Landline | Chicgozn01 |
| 312-401 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-402 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-403 | Verizon Wireless | Wireless | La Grange |
| 312-404 | T-Mobile | Wireless | Chicgozn01 |
| 312-405 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-406 | AT&T Mobility | Wireless | Wheeling |
| 312-407 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-408 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-409 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-410 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-411 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-412 | AT&T Mobility | Wireless | Wheeling |
| 312-413 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-414 | Vonage | Landline | Chicgozn01 |
| 312-415 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-416 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-417 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-418 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-419 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-420 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-421 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-422 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-423 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-424 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-425 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-426 | Onvoy | Landline | Chicgozn01 |
| 312-427 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-428 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-429 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-430 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-431 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-432 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-433 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-434 | T-Mobile | Wireless | Chicgozn01 |
| 312-435 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-436 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-437 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-438 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-439 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-440 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-441 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-442 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-443 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-444 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-445 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-446 | T-Mobile | Wireless | Chicgozn01 |
| 312-447 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-448 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-449 | Wavenation | Landline | Chicgozn01 |
| 312-450 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-451 | T-Mobile | Wireless | Chicgozn01 |
| 312-452 | Spectrum | Landline | Chicgozn01 |
| 312-453 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-454 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-455 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-456 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-457 | American Messaging Services | Landline | Chicgozn01 |
| 312-458 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-459 | T-Mobile | Wireless | Chicgozn01 |
| 312-460 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-461 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-462 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-463 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-464 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-465 | Paetec Itel | Landline | Chicgozn01 |
| 312-466 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-467 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-468 | T-Mobile | Wireless | Chicgozn01 |
| 312-469 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-470 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-471 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-472 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-473 | Onvoy | Landline | Chicgozn01 |
| 312-474 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-475 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-476 | T-Mobile | Wireless | Chicgozn01 |
| 312-477 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-478 | T-Mobile | Wireless | Chicgozn01 |
| 312-479 | Teleport Communications America | Landline | Chicgozn01 |
| 312-480 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-481 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-482 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-483 | T-Mobile | Wireless | Chicgozn01 |
| 312-484 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-485 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-486 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-487 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-488 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-489 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-490 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-491 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-492 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-493 | T-Mobile | Wireless | Chicgozn01 |
| 312-494 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-495 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-496 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-497 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-498 | T-Mobile | Wireless | Chicgozn01 |
| 312-499 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-500 | Onvoy | Landline | Chicgozn01 |
| 312-501 | Verizon Wireless | Wireless | La Grange |
| 312-502 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-503 | Teleport Communications America | Landline | Chicgozn01 |
| 312-504 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-505 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-506 | First Communications | Landline | Chicgozn01 |
| 312-507 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-508 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-509 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-510 | AT&T Mobility | Wireless | Hinsdale |
| 312-511 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-512 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-513 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-514 | American Messaging Services | Landline | Chicgozn01 |
| 312-515 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-516 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-517 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-518 | AT&T Mobility | Wireless | Wheeling |
| 312-519 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-520 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-521 | Teleport Communications America | Landline | Chicgozn01 |
| 312-522 | T-Mobile | Wireless | Chicgozn01 |
| 312-523 | T-Mobile | Wireless | Chicgozn01 |
| 312-524 | AT&T Mobility | Wireless | Wheeling |
| 312-525 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-526 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-527 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-528 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-529 | AT&T | Landline | Chicgozn01 |
| 312-530 | Stratus Networks | Landline | Chicgozn01 |
| 312-531 | AT&T Mobility | Wireless | Hinsdale |
| 312-532 | T-Mobile | Wireless | Chicgozn01 |
| 312-533 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-534 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-535 | Bandwidth.com | Landline | Chicgozn01 |
| 312-536 | T-Mobile | Wireless | Chicgozn01 |
| 312-537 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-538 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-539 | T-Mobile | Wireless | Chicgozn01 |
| 312-540 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-541 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-542 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-543 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-544 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-545 | T-Mobile | Wireless | Chicgozn01 |
| 312-546 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-547 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-548 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-549 | Teleport Communications America | Landline | Chicgozn01 |
| 312-550 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-551 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-552 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-553 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-554 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-555 | Multiple Ocn Listing | Landline | Dir Asst |
| 312-556 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-557 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-558 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-559 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-560 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-561 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-562 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-563 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-564 | First Communications | Landline | Chicgozn01 |
| 312-565 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-566 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-567 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-568 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-569 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-570 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-571 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-572 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-573 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-574 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-575 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-576 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-577 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-578 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-579 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-580 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-581 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-582 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-583 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-584 | Voip Innovations | Landline | Chicgozn01 |
| 312-585 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-586 | Onvoy | Landline | Chicgozn01 |
| 312-587 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-588 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-589 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-590 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-591 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-592 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-593 | T-Mobile | Wireless | Chicgozn01 |
| 312-594 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-595 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-596 | Teleport Communications America | Landline | Chicgozn01 |
| 312-597 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-598 | Onvoy | Landline | Chicgozn01 |
| 312-599 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-600 | Onvoy | Landline | Chicgozn01 |
| 312-601 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-602 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-603 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-604 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-605 | Paetec Itel | Landline | Chicgozn01 |
| 312-606 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-607 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-608 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-609 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-610 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-611 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-612 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-613 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-614 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-615 | AT&T Mobility | Wireless | Wheeling |
| 312-616 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-617 | T-Mobile | Wireless | Chicgozn01 |
| 312-618 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-619 | T-Mobile | Wireless | Chicgozn01 |
| 312-620 | Bandwidth.com | Landline | Chicgozn01 |
| 312-621 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-622 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-623 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-624 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-625 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-626 | Onvoy | Landline | Chicgozn01 |
| 312-627 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-628 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-629 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-630 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-631 | CenturyLink | Landline | Chicgozn01 |
| 312-632 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-633 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-634 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-635 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-636 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-637 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-638 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-639 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-640 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-641 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-642 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-643 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-644 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-645 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-646 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-647 | T-Mobile | Wireless | Chicgozn01 |
| 312-648 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-649 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-650 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-651 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-652 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-653 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-654 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-655 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-656 | T-Mobile | Wireless | Chicgozn01 |
| 312-657 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-658 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-659 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-660 | Teleport Communications America | Landline | Chicgozn01 |
| 312-661 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-662 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-663 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-664 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-665 | Teleport Communications America | Landline | Chicgozn01 |
| 312-666 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-667 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-668 | Csc Wireless | Wireless | Chicgozn01 |
| 312-669 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-670 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-671 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-672 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-673 | First Communications | Landline | Chicgozn01 |
| 312-674 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-675 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-676 | First Communications | Landline | Chicgozn01 |
| 312-677 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-678 | T-Mobile | Wireless | Chicgozn01 |
| 312-679 | U.S. Telepacific | Landline | Chicgozn01 |
| 312-680 | Onvoy | Landline | Chicgozn01 |
| 312-681 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-682 | Nuso | Landline | Chicgozn01 |
| 312-683 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-684 | T-Mobile | Wireless | Chicgozn01 |
| 312-685 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-686 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-687 | T-Mobile | Wireless | Chicgozn01 |
| 312-688 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-689 | American Messaging Services | Landline | Chicgozn01 |
| 312-690 | Rclec | Landline | Chicgozn01 |
| 312-691 | Indiana Paging Network | Landline | Chicgozn01 |
| 312-692 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-693 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-694 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-695 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-696 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-697 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-698 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-699 | AT&T Mobility | Wireless | Hinsdale |
| 312-700 | Landline | ||
| 312-701 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-702 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-703 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-704 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-705 | Teleport Communications America | Landline | Chicgozn01 |
| 312-706 | Teleport Communications America | Landline | Chicgozn01 |
| 312-707 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-708 | Spectrum | Landline | Chicgozn01 |
| 312-709 | T-Mobile | Wireless | Chicgozn01 |
| 312-710 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-711 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-712 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-713 | American Messaging Services | Landline | Chicgozn01 |
| 312-714 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-715 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-716 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-717 | Usa Mobility Wireless | Wireless | La Grange |
| 312-718 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-719 | T-Mobile | Wireless | Chicgozn01 |
| 312-720 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-721 | T-Mobile | Wireless | Chicgozn01 |
| 312-722 | Paetec Itel | Landline | Chicgozn01 |
| 312-723 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-724 | Bandwidth.com | Landline | Chicgozn01 |
| 312-725 | Bandwidth.com | Landline | Chicgozn01 |
| 312-726 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-727 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-728 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-729 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-730 | AT&T | Landline | Chicgozn01 |
| 312-731 | T-Mobile | Wireless | Chicgozn01 |
| 312-732 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-733 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-734 | Teleport Communications America | Landline | Chicgozn01 |
| 312-735 | T-Mobile | Wireless | Chicgozn04 |
| 312-736 | Teleport Communications America | Landline | Chicgozn01 |
| 312-737 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-738 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-739 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-740 | American Messaging Services | Landline | Chicgozn01 |
| 312-741 | Paetec Itel | Landline | Chicgozn01 |
| 312-742 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-743 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-744 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-745 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-746 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-747 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-748 | Onvoy | Landline | Chicgozn01 |
| 312-749 | AT&T Mobility | Wireless | Hinsdale |
| 312-750 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-751 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-752 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-753 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-754 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-755 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-756 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-757 | Bandwidth.com | Landline | Chicgozn01 |
| 312-758 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-759 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-760 | American Messaging Services | Landline | Chicgozn01 |
| 312-761 | Telengy | Landline | Chicgozn01 |
| 312-762 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-763 | Comcast | Landline | Chicgozn01 |
| 312-764 | Teleport Communications America | Landline | Chicgozn01 |
| 312-765 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-766 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-767 | Bandwidth.com | Landline | Chicgozn01 |
| 312-768 | Teleport Communications America | Landline | Chicgozn01 |
| 312-769 | Indiana Paging Network | Landline | Chicgozn01 |
| 312-770 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-771 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-772 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-773 | Spectrum | Landline | Chicgozn01 |
| 312-774 | T-Mobile | Wireless | Chicgozn01 |
| 312-775 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-776 | T-Mobile | Wireless | Chicgozn01 |
| 312-777 | Teleport Communications America | Landline | Chicgozn01 |
| 312-778 | Onvoy | Landline | Chicgozn01 |
| 312-779 | Onvoy | Landline | Chicgozn01 |
| 312-780 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-781 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-782 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-783 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-784 | First Communications | Landline | Chicgozn01 |
| 312-785 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-786 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-787 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-788 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-789 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-790 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-791 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-792 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-793 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-794 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-795 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-796 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-797 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-798 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-799 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-800 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-801 | Nuso | Landline | Chicgozn01 |
| 312-802 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-803 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-804 | T-Mobile | Wireless | Chicgozn01 |
| 312-805 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-806 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-807 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-808 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-809 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-810 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-811 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-812 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-813 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-814 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-815 | Airespring | Landline | Chicgozn01 |
| 312-816 | AT&T Mobility | Wireless | Hinsdale |
| 312-817 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-818 | T-Mobile | Wireless | Chicgozn01 |
| 312-819 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-820 | Onvoy | Landline | Chicgozn01 |
| 312-821 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-822 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-823 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-824 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-825 | T-Mobile | Wireless | Chicgozn01 |
| 312-826 | T-Mobile | Wireless | Chicgozn01 |
| 312-827 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-828 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-829 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-830 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-831 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-832 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-833 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-834 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-835 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-836 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-837 | Comcast | Landline | Chicgozn01 |
| 312-838 | T-Mobile | Wireless | Chicgozn01 |
| 312-839 | American Messaging Services | Landline | Chicgozn01 |
| 312-840 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-841 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-842 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-843 | Teleport Communications America | Landline | Chicgozn01 |
| 312-844 | AT&T Mobility | Wireless | Hinsdale |
| 312-845 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-846 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-847 | Onvoy | Landline | Chicgozn01 |
| 312-848 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-849 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-850 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-851 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-852 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-853 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-854 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-855 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-856 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-857 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-858 | Rclec | Landline | Chicgozn01 |
| 312-859 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-860 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-861 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-862 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-863 | Paetec Itel | Landline | Chicgozn01 |
| 312-864 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-865 | AT&T Mobility | Wireless | Wheeling |
| 312-866 | T-Mobile | Wireless | Chicgozn01 |
| 312-867 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-868 | Bandwidth.com | Landline | Chicgozn01 |
| 312-869 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-870 | First Communications | Landline | Chicgozn01 |
| 312-871 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-872 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-873 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-874 | T-Mobile | Wireless | Chicgozn01 |
| 312-875 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-876 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-877 | AT&T | Landline | Chicgozn01 |
| 312-878 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-879 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-880 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-881 | Paetec Itel | Landline | Chicgozn01 |
| 312-882 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-883 | Bandwidth.com | Landline | Chicgozn01 |
| 312-884 | Paetec Itel | Landline | Chicgozn01 |
| 312-885 | T-Mobile | Wireless | Chicgozn01 |
| 312-886 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-887 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-888 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-889 | Teleport Communications America | Landline | Chicgozn01 |
| 312-890 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-891 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-892 | Teleport Communications America | Landline | Chicgozn01 |
| 312-893 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-894 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-895 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-896 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-897 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-898 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-899 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-900 | Fractel | Landline | Chicgozn01 |
| 312-901 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-902 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-903 | American Messaging Services | Landline | Chicgozn01 |
| 312-904 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-905 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-906 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-907 | T-Mobile | Wireless | Chicgozn01 |
| 312-908 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-909 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-910 | Onvoy | Landline | Chicgozn01 |
| 312-911 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 312-912 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-913 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-914 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-915 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-917 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-918 | T-Mobile | Wireless | Chicgozn01 |
| 312-919 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-920 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-921 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-922 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-923 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-924 | Paetec Itel | Landline | Chicgozn01 |
| 312-925 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-926 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-927 | T-Mobile | Wireless | Chicgozn01 |
| 312-928 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-929 | T-Mobile | Wireless | Chicgozn01 |
| 312-930 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-931 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-932 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-933 | T-Mobile | Wireless | Chicgozn01 |
| 312-934 | T-Mobile | Wireless | Chicgozn01 |
| 312-935 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-936 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-937 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-938 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-939 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-940 | Peerless Network Of Illinois | Landline | Chicgozn01 |
| 312-941 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-942 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-943 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-944 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-945 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-946 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-947 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-948 | Paetec Itel | Landline | Chicgozn01 |
| 312-949 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-950 | Landline | ||
| 312-951 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-952 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-953 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-954 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-955 | Rcn Telecom Services Of Illinios | Landline | Chicgozn01 |
| 312-956 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-957 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-958 | Landline | ||
| 312-959 | Landline | ||
| 312-960 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-961 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-962 | Lumen/Level 3 | Landline | Chicgozn01 |
| 312-963 | Usa Mobility Wireless | Wireless | Chicgozn01 |
| 312-964 | Onvoy | Landline | Chicgozn01 |
| 312-965 | Verizon Wireless | Wireless | Chicgozn01 |
| 312-966 | Metro by T-Mobile | Wireless | Chicgozn01 |
| 312-967 | Bandwidth.com | Landline | Chicgozn01 |
| 312-968 | Verizon Wireless | Wireless | La Grange |
| 312-969 | Verizon Wireless | Wireless | La Grange |
| 312-970 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-971 | Bandwidth.com | Landline | Chicgozn01 |
| 312-972 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-973 | MCI/Verizon | Wireless | Chicgozn01 |
| 312-974 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-975 | T-Mobile | Wireless | Chicgozn01 |
| 312-976 | Landline | ||
| 312-977 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-978 | T-Mobile | Wireless | Chicgozn01 |
| 312-979 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-980 | Teleport Communications America | Landline | Chicgozn01 |
| 312-981 | Paetec Itel | Landline | Chicgozn01 |
| 312-982 | Comcast | Landline | Chicgozn01 |
| 312-983 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-984 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-985 | Paetec Itel | Landline | Chicgozn01 |
| 312-986 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-987 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-988 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-989 | AT&T Mobility | Wireless | Chicgozn01 |
| 312-990 | AT&T Mobility | Wireless | Hinsdale |
| 312-991 | AT&T Mobility | Wireless | Wheeling |
| 312-992 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-993 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-994 | Paetec Itel | Landline | Chicgozn01 |
| 312-995 | Teleport Communications America | Landline | Chicgozn01 |
| 312-996 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-997 | AT&T (IL Bell) | Landline | Chicgozn01 |
| 312-998 | CenturyLink | Landline | Chicgozn01 |
| 312-999 | MCI/Verizon | Wireless | Chicgozn01 |
Overlay Area Codes
All 17 area codes in Illinois
About Area Code 312
Picture this: Back in 1947, as America was buzzing with post-war energy, area code 312 got its start as one of the original codes in the North American plan. That's right, it was there from the beginning, covering the heart of Illinois and centering on Chicago, that gritty city by the lake. This code wraps around neighborhoods like Albany Park, where you might find families chatting over backyard barbecues, or Austin, with its mix of old-school diners and modern vibes. Then there's Avondale, full of eclectic shops, and Bridgeport, known for its blue-collar roots and that famous stadium where the Cubs play. Chicago itself is the star, a place where the El train rattles overhead and the wind whips off Lake Michigan. Over the years, as more people moved in and phones multiplied, they added overlay code 872 to handle the demand, but 312 keeps its original charm. It's all about that central time zone feel, UTC-6, where days start with coffee from local roasters and end with neighborhood festivals. What makes 312 stand out? It's not just numbers; it's the pulse of a city that's seen it all, from jazz clubs in the 20s to today's food truck scene. Folks here are straightforward, just like their calls—straight to the point, no nonsense. If you're dialing into 312, you're tapping into a slice of American hustle that's equal parts history and everyday life, serving up 38 cities that keep the connections real and the stories flowing.
⚠ Scam & Spam Alert for 312
In Illinois, like anywhere else, scammers love to target phone numbers in area code 312, preying on busy Chicagoans with slick pitches. You might get calls from folks claiming to be from the IRS, demanding immediate payment for some made-up tax debt—don't buy it, since the real IRS never asks for money over the phone. Then there are those auto warranty scams, where a smooth talker says your car's coverage is about to expire and pressures you to sign up right away. Oh, and utility scams are common too, with callers pretending to be from ComEd or another provider, threatening to cut off your service unless you pay up fast. It's frustrating, but remember, these tricks are designed to catch you off guard. Here's a simple tip: Always hang up and call back the official number on your statements to verify anything suspicious. That way, you keep your info safe without getting roped in.
Local Snapshot
Chicago's population hovers around 2.7 million people, making it one of the biggest cities in the Midwest. Finance and manufacturing drive the economy here, with giants like Boeing and big banks keeping things humming. The area's famous for its food scene, especially deep-dish pizza that could make anyone crave a slice on a cold night. One surprising fact is that Chicago has more than 77 distinct neighborhoods, each with its own personality, from the artsy vibes of Wicker Park to the historic streets of Lincoln Park.
Frequently Asked Questions
Where is area code 312?
Area code 312 serves Chicago and surrounding communities in Illinois, including Albany Park, Austin, Avondale, Berwyn, Beverly and 33 more. It is in the Central time zone.
What cities are in area code 312?
Area code 312 covers 38 cities in Illinois: Albany Park, Austin, Avondale, Berwyn, Beverly, Bridgeport, Calumet City, Chicago, Chinatown, Cicero, and 28 more
What time zone is 312?
Area code 312 is in the Central time zone (UTC-6).
When was area code 312 created?
Area code 312 is one of the original area codes established in 1947 as part of the North American Numbering Plan.
Is 312 a legitimate area code?
Yes, 312 is a valid, active area code assigned to Chicago, Illinois. However, scammers can spoof any area code, so receiving a call from 312 doesn't guarantee the caller is actually in this area.
What area codes overlap with 312?
Area code 312 shares its geographic area with overlay code 872. This means all local calls in the area require 10-digit dialing.
What historical significance does the 312 area code hold in Chicago's development?
The 312 area code was established in 1947 as one of the original codes, helping to organize telephone services during Chicago's industrial expansion. It initially covered the entire city, including key neighborhoods like Bridgeport where political figures emerged. Over decades, it became linked to the city's core identity as a transportation and commerce center.
Which industries in Chicago are most associated with the 312 area code?
Finance and trading firms dominate in the 312 area, with the Chicago Mercantile Exchange playing a central role in global markets. Manufacturing and food processing plants in neighborhoods like Austin have historical ties to the code. These sectors have driven economic activity in the city's inner districts served by 312.
How has the 312 area code adapted to Chicago's population changes?
The 312 area code, originally for all of Chicago in 1947, was split in 1996 to create 773 for outer areas due to growing demand from population increases. This change allowed the city to handle more phone lines as neighborhoods like Avondale expanded with new residents. Today, 312 still covers central Chicago, including cultural hubs like theaters and museums.