815
Rockford, Illinois
Illinois · Central (UTC-6) · — · 18 cities · Overlay: 779
State
Major City
Rockford
Time Zone
Central (UTC-6)
Current Local Time
—
Overlay Code
Cities Served
18
Cities Served by Area Code 815 (18 cities)
Additional Details
Established
1947
Type
Original (1947)
Active Prefixes
800
Wireless Lines
24%
About Area Code 815
Area code 815 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 Rockford area for over 75 years. This area code shares its territory with overlay code 779, meaning callers must dial all 10 digits for local calls. The area is in the Central time zone. It covers 18 cities and communities including Belvidere, Bolingbrook, Channahon, Crystal Lake, DeKalb and 13 more.
Phone Number Prefixes in Area Code 815
800 active NXX prefixes — 24% wireless, 76% landline. Each prefix (NXX) represents up to 10,000 phone numbers.
Frontier 160 (20%)AT&T (IL Bell) 157 (20%)Lumen/Level 3 76 (10%)Verizon Wireless 50 (6%)Aero North Communications 43 (5%)
| Prefix | Carrier | Type | Rate Center |
|---|---|---|---|
| 815-200 | Paetec Itel | Landline | La Salle |
| 815-201 | Bandwidth.com | Landline | Sheridan |
| 815-202 | AT&T Mobility | Wireless | Oglesby |
| 815-203 | Usa Mobility Wireless | Wireless | Joliet |
| 815-204 | Usa Mobility Wireless | Wireless | Crystal Lk |
| 815-205 | CenturyLink | Landline | Coal City |
| 815-206 | AT&T (IL Bell) | Landline | Woodstock |
| 815-207 | Teleport Communications America | Landline | Joliet |
| 815-208 | Mediacom Telephony Of Illinois | Landline | Fulton |
| 815-209 | Lumen/Level 3 | Landline | Rockford |
| 815-210 | AT&T Mobility | Wireless | Joliet |
| 815-211 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-212 | T-Mobile | Wireless | Joliet |
| 815-213 | US Cellular | Wireless | Sterling |
| 815-214 | Rcn Telecom Services Of Illinios | Landline | Kankakee |
| 815-215 | First Communications | Landline | New Lenox |
| 815-216 | Verizon Wireless | Wireless | Kankakee |
| 815-217 | Digital Network Access Communications | Landline | De Kalb |
| 815-218 | Verizon Wireless | Wireless | Rockford |
| 815-219 | Metro by T-Mobile | Wireless | Crystal Lk |
| 815-220 | AT&T (IL Bell) | Landline | La Salle |
| 815-221 | Teleport Communications America | Landline | Lockport |
| 815-222 | Verizon Wireless | Wireless | Rockford |
| 815-223 | AT&T (IL Bell) | Landline | La Salle |
| 815-224 | AT&T (IL Bell) | Landline | La Salle |
| 815-225 | Frontier | Landline | Milledgevl |
| 815-226 | AT&T (IL Bell) | Landline | Rockford |
| 815-227 | AT&T (IL Bell) | Landline | Rockford |
| 815-228 | AT&T Mobility | Wireless | Oglesby |
| 815-229 | AT&T (IL Bell) | Landline | Rockford |
| 815-230 | Lumen/Level 3 | Landline | Plainfield |
| 815-231 | AT&T (IL Bell) | Landline | Rockford |
| 815-232 | Frontier | Landline | Freeport |
| 815-233 | Frontier | Landline | Freeport |
| 815-234 | Frontier | Landline | Byron |
| 815-235 | Frontier | Landline | Freeport |
| 815-236 | AT&T Mobility | Wireless | Woodstock |
| 815-237 | AT&T (IL Bell) | Landline | Gardner |
| 815-238 | Verizon Wireless | Wireless | Freeport |
| 815-239 | Frontier | Landline | Pecatonica |
| 815-240 | Spectrum | Landline | Rock Cut |
| 815-241 | American Messaging Services | Landline | Northbrook |
| 815-242 | Bandwidth.com | Landline | Minooka |
| 815-243 | US Cellular | Wireless | Rockford |
| 815-244 | Brightspeed Of Illinois | Landline | Mt Carroll |
| 815-245 | AT&T Mobility | Wireless | Woodstock |
| 815-246 | Frontier | Landline | Earlville |
| 815-247 | Frontier | Landline | Seward |
| 815-248 | Frontier | Landline | Durand |
| 815-249 | Frontier | Landline | Grandridge |
| 815-250 | Comcast | Landline | La Salle |
| 815-251 | Brightspeed Of Illinois | Landline | Nelson |
| 815-252 | AT&T Mobility | Wireless | Oglesby |
| 815-253 | Frontier | Landline | Kempton |
| 815-254 | AT&T (IL Bell) | Landline | Plainfield |
| 815-255 | Paetec Itel | Landline | Minooka |
| 815-256 | Stelle Tel. Co | Landline | Stelle |
| 815-257 | Verizon Wireless | Wireless | Streator |
| 815-258 | AT&T Mobility | Wireless | Joliet |
| 815-259 | Brightspeed Of Illinois | Landline | Thomson |
| 815-260 | T-Mobile | Wireless | Joliet |
| 815-261 | MCI/Verizon | Wireless | Crystal Lk |
| 815-262 | Verizon Wireless | Wireless | Rockford |
| 815-263 | Verizon Wireless | Wireless | Kankakee |
| 815-264 | Frontier | Landline | Waterman |
| 815-265 | AT&T (IL Bell) | Landline | Gilman |
| 815-266 | Frontier | Landline | Freeport |
| 815-267 | MCI/Verizon | Wireless | Plainfield |
| 815-268 | AT&T (IL Bell) | Landline | Onarga |
| 815-269 | Frontier | Landline | Danforth |
| 815-270 | Spectrum | Landline | Roscoe |
| 815-271 | MCI/Verizon | Wireless | Mchenry |
| 815-272 | MCI/Verizon | Wireless | Joliet |
| 815-273 | Brightspeed Of Illinois | Landline | Savanna |
| 815-274 | AT&T Mobility | Wireless | Joliet |
| 815-275 | Verizon Wireless | Wireless | Freeport |
| 815-276 | Teleport Communications America | Landline | Crystal Lk |
| 815-277 | Teleport Communications America | Landline | Frankfort |
| 815-278 | Verizon Wireless | Wireless | Kankakee |
| 815-279 | American Messaging Services | Landline | Kankakee |
| 815-280 | Teleport Communications America | Landline | Joliet |
| 815-281 | US Cellular | Wireless | Galena |
| 815-282 | AT&T (IL Bell) | Landline | Rockford |
| 815-283 | Mediacom Telephony Of Illinois | Landline | Waterman |
| 815-284 | Brightspeed Of Illinois | Landline | Dixon |
| 815-285 | Brightspeed Of Illinois | Landline | Dixon |
| 815-286 | Frontier | Landline | Hinckley |
| 815-287 | AT&T (IL Bell) | Landline | Verona |
| 815-288 | Brightspeed Of Illinois | Landline | Dixon |
| 815-289 | US Cellular | Wireless | Rockford |
| 815-290 | AT&T | Landline | Minooka |
| 815-291 | US Cellular | Wireless | Freeport |
| 815-292 | Bergen Tel. Co. - Il | Landline | So Bergen |
| 815-293 | AT&T (IL Bell) | Landline | Lockport |
| 815-294 | Usa Mobility Wireless | Wireless | La Grange |
| 815-295 | T-Mobile | Wireless | Kankakee |
| 815-296 | Telnyx | Landline | Rockford |
| 815-297 | Frontier | Landline | Freeport |
| 815-298 | Verizon Wireless | Wireless | Rockford |
| 815-299 | US Cellular | Wireless | Rockford |
| 815-300 | AT&T (IL Bell) | Landline | New Lenox |
| 815-301 | Lumen/Level 3 | Landline | Crystal Lk |
| 815-302 | Metro by T-Mobile | Wireless | Joliet |
| 815-303 | Verizon Wireless | Wireless | Princeton |
| 815-304 | Lumen/Level 3 | Landline | Kankakee |
| 815-305 | Lumen/Level 3 | Landline | Gardner |
| 815-306 | Lumen/Level 3 | Landline | Lockport |
| 815-307 | Lumen/Level 3 | Landline | Mchenry |
| 815-308 | Lumen/Level 3 | Landline | Woodstock |
| 815-309 | Aero North Communications | Landline | Shannon |
| 815-310 | Lumen/Level 3 | Landline | Utica |
| 815-311 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-312 | Onvoy | Landline | Rockford |
| 815-313 | Lumen/Level 3 | Landline | Ottawa |
| 815-314 | Lumen/Level 3 | Landline | Manhattan |
| 815-315 | Lumen/Level 3 | Landline | Rockford |
| 815-316 | Lumen/Level 3 | Landline | Rockford |
| 815-317 | Lumen/Level 3 | Landline | Crescentcy |
| 815-318 | Lumen/Level 3 | Landline | Morris |
| 815-319 | US Cellular | Wireless | Rockford |
| 815-320 | Peerless Network Of Illinois | Landline | New Lenox |
| 815-321 | Onvoy | Landline | Woodstock |
| 815-322 | Lumen/Level 3 | Landline | Mchenry |
| 815-323 | Lumen/Level 3 | Landline | Belvidere |
| 815-324 | Mcc Telephony | Landline | Ottawa |
| 815-325 | AT&T Mobility | Wireless | Joliet |
| 815-326 | AT&T Mobility | Wireless | Oglesby |
| 815-327 | Lumen/Level 3 | Landline | Plainfield |
| 815-328 | Lumen/Level 3 | Landline | Lockport |
| 815-329 | AT&T | Landline | Rockford |
| 815-330 | First Communications | Landline | Crescentcy |
| 815-331 | Lumen/Level 3 | Landline | Mchenry |
| 815-332 | Frontier | Landline | Cherry Vly |
| 815-333 | Lumen/Level 3 | Landline | Woodstock |
| 815-334 | AT&T (IL Bell) | Landline | Woodstock |
| 815-335 | Frontier | Landline | Winnebago |
| 815-336 | Frontier | Landline | Coleta |
| 815-337 | AT&T (IL Bell) | Landline | Woodstock |
| 815-338 | AT&T (IL Bell) | Landline | Woodstock |
| 815-339 | Frontier | Landline | Granville |
| 815-340 | Comcast | Landline | La Moille |
| 815-341 | AT&T Mobility | Wireless | Joliet |
| 815-342 | AT&T Mobility | Wireless | Joliet |
| 815-343 | AT&T Mobility | Wireless | Oglesby |
| 815-344 | AT&T (IL Bell) | Landline | Mchenry |
| 815-345 | Lumen/Level 3 | Landline | Woodstock |
| 815-346 | Lumen/Level 3 | Landline | Gardner |
| 815-347 | Verizon Wireless | Wireless | Woodstock |
| 815-348 | Paetec Itel | Landline | Kankakee |
| 815-349 | MCI/Verizon | Wireless | Mchenry |
| 815-350 | Aero North Communications | Landline | Frankligrv |
| 815-351 | Verizon Wireless | Wireless | Kankakee |
| 815-352 | Lumen/Level 3 | Landline | Kankakee |
| 815-353 | Verizon Wireless | Wireless | Woodstock |
| 815-354 | Verizon Wireless | Wireless | Woodstock |
| 815-355 | Verizon Wireless | Wireless | Woodstock |
| 815-356 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-357 | AT&T (IL Bell) | Landline | Seneca |
| 815-358 | C-R Telephone Co | Landline | Cornell |
| 815-359 | Brightspeed Of Illinois | Landline | Harmon |
| 815-360 | Aero North Communications | Landline | Sublette |
| 815-361 | Lumen/Level 3 | Landline | Manhattan |
| 815-362 | Frontier | Landline | German Vly |
| 815-363 | AT&T (IL Bell) | Landline | Mchenry |
| 815-364 | Lumen/Level 3 | Landline | Morris |
| 815-365 | Frontier | Landline | Reddick |
| 815-366 | Lumen/Level 3 | Landline | Ottawa |
| 815-367 | Frontier | Landline | Winslow |
| 815-368 | Frontier | Landline | Lostant |
| 815-369 | Frontier | Landline | Lena |
| 815-370 | Verizon Wireless | Wireless | Kankakee |
| 815-371 | Lumen/Level 3 | Landline | Utica |
| 815-372 | AT&T (IL Bell) | Landline | Lockport |
| 815-373 | Paetec Itel | Landline | Elwood |
| 815-374 | Paetec Itel | Landline | Dwight |
| 815-375 | US Cellular | Wireless | De Kalb |
| 815-376 | Frontier | Landline | Ohio |
| 815-377 | Lumen/Level 3 | Landline | Crescentcy |
| 815-378 | T-Mobile | Wireless | Rockford |
| 815-379 | Frontier | Landline | Walnut |
| 815-380 | Lumen/Level 3 | Landline | Sterling |
| 815-381 | AT&T (IL Bell) | Landline | Rockford |
| 815-382 | AT&T Mobility | Wireless | Woodstock |
| 815-383 | AT&T Mobility | Wireless | Crescentcy |
| 815-384 | Frontier | Landline | Creston |
| 815-385 | AT&T (IL Bell) | Landline | Mchenry |
| 815-386 | Verizon Wireless | Wireless | Kankakee |
| 815-387 | AT&T (IL Bell) | Landline | Rockford |
| 815-388 | Metro by T-Mobile | Wireless | Mchenry |
| 815-389 | AT&T (IL Bell) | Landline | So Beloit |
| 815-390 | Comcast | Landline | Braidwood |
| 815-391 | AT&T (IL Bell) | Landline | Rockford |
| 815-392 | Kinsman Mutual Tel. Co | Landline | Kinsman |
| 815-393 | Frontier | Landline | Monroe Ctr |
| 815-394 | AT&T (IL Bell) | Landline | Rockford |
| 815-395 | AT&T (IL Bell) | Landline | Rockford |
| 815-396 | Frontier | Landline | Steward |
| 815-397 | AT&T (IL Bell) | Landline | Rockford |
| 815-398 | AT&T (IL Bell) | Landline | Rockford |
| 815-399 | AT&T (IL Bell) | Landline | Rockford |
| 815-400 | Mediacom Telephony Of Illinois | Landline | Morrison |
| 815-401 | Lumen/Level 3 | Landline | Kankakee |
| 815-402 | Lumen/Level 3 | Landline | Galena |
| 815-403 | Metro by T-Mobile | Wireless | Mchenry |
| 815-404 | Metro by T-Mobile | Wireless | Crystal Lk |
| 815-405 | T-Mobile | Wireless | Joliet |
| 815-406 | Frontier | Landline | Byron |
| 815-407 | AT&T (IL Bell) | Landline | Lockport |
| 815-408 | Bandwidth.com | Landline | Utica |
| 815-409 | Verizon Wireless | Wireless | Joliet |
| 815-410 | Lumen/Level 3 | Landline | La Salle |
| 815-411 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-412 | Lumen/Level 3 | Landline | Frankfort |
| 815-413 | First Communications | Landline | Morris |
| 815-414 | AT&T Mobility | Wireless | Earlville |
| 815-415 | AT&T (IL Bell) | Landline | Seneca |
| 815-416 | AT&T (IL Bell) | Landline | Morris |
| 815-417 | AT&T (IL Bell) | Landline | Braidwood |
| 815-418 | First Communications | Landline | Manhattan |
| 815-419 | Verizon Wireless | Wireless | Pontiac |
| 815-420 | Onvoy | Landline | Rockford |
| 815-421 | AT&T (IL Bell) | Landline | Herscher |
| 815-422 | AT&T (IL Bell) | Landline | St Anne |
| 815-423 | AT&T (IL Bell) | Landline | Elwood |
| 815-424 | AT&T (IL Bell) | Landline | Elwood |
| 815-425 | Lumen/Level 3 | Landline | Crystal Lk |
| 815-426 | AT&T (IL Bell) | Landline | Herscher |
| 815-427 | AT&T (IL Bell) | Landline | St Anne |
| 815-428 | Frontier | Landline | Martinton |
| 815-429 | Frontier | Landline | Sheldon |
| 815-430 | First Communications | Landline | Mchenry |
| 815-431 | AT&T (IL Bell) | Landline | Ottawa |
| 815-432 | AT&T (IL Bell) | Landline | Watseka |
| 815-433 | AT&T (IL Bell) | Landline | Ottawa |
| 815-434 | AT&T (IL Bell) | Landline | Ottawa |
| 815-435 | Frontier | Landline | Beavervl |
| 815-436 | AT&T (IL Bell) | Landline | Plainfield |
| 815-437 | Frontier | Landline | Putnam |
| 815-438 | Frontier | Landline | Tampico |
| 815-439 | AT&T (IL Bell) | Landline | Plainfield |
| 815-440 | Verizon Wireless | Wireless | Dixon |
| 815-441 | Verizon Wireless | Wireless | Sterling |
| 815-442 | Tonica Tel. Co | Landline | Tonica |
| 815-443 | Frontier | Landline | Pearl City |
| 815-444 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-445 | Frontier | Landline | Manlius |
| 815-446 | Frontier | Landline | Cedarpoint |
| 815-447 | Frontier | Landline | Depue |
| 815-448 | AT&T (IL Bell) | Landline | Mazon |
| 815-449 | Frontier | Landline | Dakota |
| 815-450 | AT&T Mobility | Wireless | Momence |
| 815-451 | AT&T Mobility | Wireless | Woodstock |
| 815-452 | Frontier | Landline | Toluca |
| 815-453 | Frontier | Landline | Ashton |
| 815-454 | Frontier | Landline | Sheffield |
| 815-455 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-456 | Frontier | Landline | Frankligrv |
| 815-457 | Frontier | Landline | Cissnapark |
| 815-458 | AT&T (IL Bell) | Landline | Braidwood |
| 815-459 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-460 | First Communications | Landline | Joliet |
| 815-461 | MCI/Verizon | Wireless | Lockport |
| 815-462 | AT&T (IL Bell) | Landline | New Lenox |
| 815-463 | AT&T (IL Bell) | Landline | New Lenox |
| 815-464 | AT&T (IL Bell) | Landline | Frankfort |
| 815-465 | AT&T (IL Bell) | Landline | Grant Park |
| 815-466 | AT&T (IL Bell) | Landline | Grant Park |
| 815-467 | AT&T (IL Bell) | Landline | Minooka |
| 815-468 | AT&T (IL Bell) | Landline | Manteno |
| 815-469 | AT&T (IL Bell) | Landline | Frankfort |
| 815-470 | AT&T (IL Bell) | Landline | Rockford |
| 815-471 | Verizon Wireless | Wireless | Watseka |
| 815-472 | AT&T (IL Bell) | Landline | Momence |
| 815-473 | Frontier | Landline | Woodland |
| 815-474 | AT&T Mobility | Wireless | Joliet |
| 815-475 | AT&T (IL Bell) | Landline | Plattville |
| 815-476 | AT&T (IL Bell) | Landline | Wilmington |
| 815-477 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-478 | AT&T (IL Bell) | Landline | Manhattan |
| 815-479 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-480 | Usa Mobility Wireless | Wireless | Rockford |
| 815-481 | Verizon Wireless | Wireless | La Grange |
| 815-482 | T-Mobile | Wireless | Woodstock |
| 815-483 | Metro by T-Mobile | Wireless | Joliet |
| 815-484 | AT&T (IL Bell) | Landline | Rockford |
| 815-485 | AT&T (IL Bell) | Landline | New Lenox |
| 815-486 | Frontier | Landline | Donovan |
| 815-487 | First Communications | Landline | Plainfield |
| 815-488 | Verizon Wireless | Wireless | La Grange |
| 815-489 | AT&T (IL Bell) | Landline | Rockford |
| 815-490 | AT&T (IL Bell) | Landline | Rockford |
| 815-491 | Nuso | Landline | Rockford |
| 815-492 | Frontier | Landline | Appleriver |
| 815-493 | Frontier | Landline | Lanark |
| 815-494 | US Cellular | Wireless | Rockford |
| 815-495 | Frontier | Landline | Leland |
| 815-496 | Frontier | Landline | Sheridan |
| 815-497 | Frontier | Landline | Compton |
| 815-498 | Frontier | Landline | Somonauk |
| 815-499 | US Cellular | Wireless | Sterling |
| 815-500 | Mcc Telephony | Landline | Marseilles |
| 815-501 | Metro by T-Mobile | Wireless | De Kalb |
| 815-502 | First Communications | Landline | Woodstock |
| 815-503 | Metro by T-Mobile | Wireless | Mendota |
| 815-504 | First Communications | Landline | Gardner |
| 815-505 | T-Mobile | Wireless | Rockford |
| 815-506 | Lumen/Level 3 | Landline | Union |
| 815-507 | Lumen/Level 3 | Landline | Momence |
| 815-508 | AT&T Mobility | Wireless | De Kalb |
| 815-509 | T-Mobile | Wireless | Rockford |
| 815-510 | Mediacom Telephony Of Illinois | Landline | Streator |
| 815-511 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-512 | First Communications | Landline | Lockport |
| 815-513 | Lumen/Level 3 | Landline | Morris |
| 815-514 | T-Mobile | Wireless | Joliet |
| 815-515 | Lumen/Level 3 | Landline | Watseka |
| 815-516 | T-Mobile | Wireless | Rockford |
| 815-517 | MCI/Verizon | Wireless | De Kalb |
| 815-518 | First Communications | Landline | Coal City |
| 815-519 | T-Mobile | Wireless | Rockford |
| 815-520 | Verizon Wireless | Wireless | Rockford |
| 815-521 | AT&T (IL Bell) | Landline | Minooka |
| 815-522 | Frontier | Landline | Kirkland |
| 815-523 | Teleport Communications America | Landline | Kankakee |
| 815-524 | Teleport Communications America | Landline | Lockport |
| 815-525 | Tds Metrocom | Wireless | So Beloit |
| 815-526 | Teleport Communications America | Landline | Crystal Lk |
| 815-527 | Teleport Communications America | Landline | Woodstock |
| 815-528 | Teleport Communications America | Landline | Mchenry |
| 815-529 | Verizon Wireless | Wireless | Woodstock |
| 815-530 | T-Mobile | Wireless | Joliet |
| 815-531 | Teleport Communications America | Landline | Joliet |
| 815-532 | Usa Mobility Wireless | Wireless | Morris |
| 815-533 | Indiana Paging Network | Landline | La Grange |
| 815-534 | Lumen/Level 3 | Landline | Frankfort |
| 815-535 | AT&T (IL Bell) | Landline | Sterling |
| 815-536 | Usa Mobility Wireless | Wireless | La Grange |
| 815-537 | Frontier | Landline | Prophetstn |
| 815-538 | Frontier | Landline | Mendota |
| 815-539 | Frontier | Landline | Mendota |
| 815-540 | T-Mobile | Wireless | Rockford |
| 815-541 | US Cellular | Wireless | Freeport |
| 815-542 | Frontier | Landline | Thomas |
| 815-543 | US Cellular | Wireless | Rockford |
| 815-544 | Frontier | Landline | Belvidere |
| 815-545 | AT&T Mobility | Wireless | Joliet |
| 815-546 | AT&T Mobility | Wireless | Joliet |
| 815-547 | Frontier | Landline | Belvidere |
| 815-548 | AT&T (IL Bell) | Landline | Sterling |
| 815-549 | T-Mobile | Wireless | Kankakee |
| 815-550 | Lumen/Level 3 | Landline | Grant Park |
| 815-551 | Onvoy | Landline | Lanark |
| 815-552 | AT&T (IL Bell) | Landline | Lockport |
| 815-553 | Paetec Itel | Landline | Joliet |
| 815-554 | Mediacom Telephony Of Illinois | Landline | E Dubuque |
| 815-555 | Multiple Ocn Listing | Landline | Dir Asst |
| 815-556 | Lumen/Level 3 | Landline | Plainfield |
| 815-557 | Metro by T-Mobile | Wireless | Joliet |
| 815-558 | US Cellular | Wireless | Rockford |
| 815-559 | Voip Innovations | Landline | Chenoa |
| 815-560 | Metro by T-Mobile | Wireless | Harvard |
| 815-561 | Frontier | Landline | Rochelle |
| 815-562 | Frontier | Landline | Rochelle |
| 815-563 | Frontier | Landline | Cedarville |
| 815-564 | AT&T (IL Bell) | Landline | Sterling |
| 815-565 | Mediacom Telephony Of Illinois | Landline | Savanna |
| 815-566 | Lumen/Level 3 | Landline | Belvidere |
| 815-567 | Frontier | Landline | Campus |
| 815-568 | AT&T (IL Bell) | Landline | Marengo |
| 815-569 | Frontier | Landline | Capron |
| 815-570 | Lumen/Level 3 | Landline | Sandwich |
| 815-571 | Mediacom Telephony Of Illinois | Landline | Shannon |
| 815-572 | Lumen/Level 3 | Landline | Marengo |
| 815-573 | Lumen/Level 3 | Landline | Kankakee |
| 815-574 | Aero North Communications | Landline | Harmon |
| 815-575 | AT&T Mobility | Wireless | Woodstock |
| 815-576 | Aero North Communications | Landline | Polo |
| 815-577 | AT&T (IL Bell) | Landline | Plainfield |
| 815-578 | AT&T (IL Bell) | Landline | Mchenry |
| 815-579 | Metro by T-Mobile | Wireless | La Salle |
| 815-580 | AT&T | Landline | Cherry Vly |
| 815-581 | Comcast | Landline | Spring Grv |
| 815-582 | T-Mobile | Wireless | Joliet |
| 815-583 | Aero North Communications | Landline | Morrison |
| 815-584 | AT&T (IL Bell) | Landline | Dwight |
| 815-585 | Lumen/Level 3 | Landline | Morris |
| 815-586 | C-R Telephone Co | Landline | Ransom |
| 815-587 | Lumen/Level 3 | Landline | Ottawa |
| 815-588 | AT&T (IL Bell) | Landline | Lockport |
| 815-589 | Frontier | Landline | Fulton |
| 815-590 | T-Mobile | Wireless | Sterling |
| 815-591 | Frontier | Landline | Hanover |
| 815-592 | Verizon Wireless | Wireless | Kankakee |
| 815-593 | T-Mobile | Wireless | De Kalb |
| 815-594 | Frontier | Landline | Appleriver |
| 815-595 | AT&T | Landline | Oregon |
| 815-596 | AT&T | Landline | Marengo |
| 815-597 | Frontier | Landline | Gardenprri |
| 815-598 | Frontier | Landline | Massbach |
| 815-599 | Frontier | Landline | Freeport |
| 815-600 | AT&T Mobility | Wireless | Joliet |
| 815-601 | US Cellular | Wireless | Rockford |
| 815-602 | First Communications | Landline | Kankakee |
| 815-603 | T-Mobile | Wireless | Joliet |
| 815-604 | Onvoy | Landline | Belvidere |
| 815-605 | Lumen/Level 3 | Landline | Grant Park |
| 815-606 | First Communications | Landline | Ottawa |
| 815-607 | Spectrum | Landline | Pearl City |
| 815-608 | T-Mobile | Wireless | Rockford |
| 815-609 | AT&T (IL Bell) | Landline | Plainfield |
| 815-610 | Onvoy | Landline | Hennepin |
| 815-611 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-612 | AT&T Mobility | Wireless | Momence |
| 815-613 | AT&T Mobility | Wireless | Dixon |
| 815-614 | AT&T (IL Bell) | Landline | Kankakee |
| 815-615 | Lumen/Level 3 | Landline | Mendota |
| 815-616 | T-Mobile | Wireless | Freeport |
| 815-617 | Teleport Communications America | Landline | Ottawa |
| 815-618 | AT&T Mobility | Wireless | Freeport |
| 815-619 | Aero North Communications | Landline | Rockton |
| 815-620 | Peerless Network Of Illinois | Landline | Minooka |
| 815-621 | T-Mobile | Wireless | Rockford |
| 815-622 | AT&T (IL Bell) | Landline | Sterling |
| 815-623 | Frontier | Landline | Roscoe |
| 815-624 | Frontier | Landline | Rockton |
| 815-625 | AT&T (IL Bell) | Landline | Sterling |
| 815-626 | AT&T (IL Bell) | Landline | Sterling |
| 815-627 | Frontier | Landline | Paw Paw |
| 815-628 | Frontier | Landline | W Brooklyn |
| 815-629 | Frontier | Landline | Shirland |
| 815-630 | T-Mobile | Wireless | Joliet |
| 815-631 | AT&T (IL Bell) | Landline | Sterling |
| 815-632 | AT&T (IL Bell) | Landline | Sterling |
| 815-633 | AT&T (IL Bell) | Landline | Rockford |
| 815-634 | AT&T (IL Bell) | Landline | Coal City |
| 815-635 | Frontier | Landline | Chatsworth |
| 815-636 | AT&T (IL Bell) | Landline | Rockford |
| 815-637 | AT&T (IL Bell) | Landline | Rockford |
| 815-638 | Frontier | Landline | La Moille |
| 815-639 | AT&T (IL Bell) | Landline | Rockford |
| 815-640 | Teleport Communications America | Landline | Ottawa |
| 815-641 | Verizon Wireless | Wireless | Joliet |
| 815-642 | Lumen/Level 3 | Landline | Minooka |
| 815-643 | Frontier | Landline | Dover |
| 815-644 | Rcn Telecom Services Of Illinios | Landline | Crescentcy |
| 815-645 | Frontier | Landline | Stilmanvly |
| 815-646 | Frontier | Landline | Tiskilwa |
| 815-647 | Mediacom Telephony Of Illinois | Landline | Cullom |
| 815-648 | Frontier | Landline | Hebron |
| 815-649 | Rcn Telecom Services Of Illinios | Landline | Gardner |
| 815-650 | Metro by T-Mobile | Wireless | Freeport |
| 815-651 | Rcn Telecom Services Of Illinios | Landline | Joliet |
| 815-652 | Brightspeed Of Illinois | Landline | Granddtour |
| 815-653 | Frontier | Landline | Wonderlake |
| 815-654 | AT&T (IL Bell) | Landline | Rockford |
| 815-655 | Teleport Communications America | Landline | Coal City |
| 815-656 | Lumen/Level 3 | Landline | Freeport |
| 815-657 | AT&T (IL Bell) | Landline | Forrest |
| 815-658 | Teleport Communications America | Landline | Newark |
| 815-659 | Frontier | Landline | Bureau |
| 815-660 | Rcn Telecom Services Of Illinios | Landline | Lockport |
| 815-661 | Rcn Telecom Services Of Illinios | Landline | Morris |
| 815-662 | Lumen/Level 3 | Landline | Momence |
| 815-663 | Frontier | Landline | Spring Vly |
| 815-664 | Frontier | Landline | Spring Vly |
| 815-665 | Rcn Telecom Services Of Illinios | Landline | Ottawa |
| 815-666 | Verizon Wireless | Wireless | Joliet |
| 815-667 | AT&T (IL Bell) | Landline | Utica |
| 815-668 | Onvoy | Landline | Rockford |
| 815-669 | Lumen/Level 3 | Landline | Mchenry |
| 815-670 | T-Mobile | Wireless | Rockford |
| 815-671 | Lumen/Level 3 | Landline | Joliet |
| 815-672 | Frontier | Landline | Streator |
| 815-673 | Frontier | Landline | Streator |
| 815-674 | AT&T Mobility | Wireless | Streator |
| 815-675 | Frontier | Landline | Spring Grv |
| 815-676 | Lumen/Level 3 | Landline | Plainfield |
| 815-677 | Verizon Wireless | Wireless | Dixon |
| 815-678 | Frontier | Landline | Richmond |
| 815-679 | Rcn Telecom Services Of Illinios | Landline | Mchenry |
| 815-680 | Rcn Telecom Services Of Illinios | Landline | Manhattan |
| 815-681 | Verizon Wireless | Wireless | Oglesby |
| 815-682 | Frontier | Landline | Stockland |
| 815-683 | AT&T (IL Bell) | Landline | Crescentcy |
| 815-684 | Frontier | Landline | Chadwick |
| 815-685 | AT&T Mobility | Wireless | Joliet |
| 815-686 | Frontier | Landline | Piper City |
| 815-687 | Rcn Telecom Services Of Illinios | Landline | Woodstock |
| 815-688 | Frontier | Landline | Strawn |
| 815-689 | Frontier | Landline | Cullom |
| 815-690 | T-Mobile | Wireless | Joliet |
| 815-691 | Rcn Telecom Services Of Illinios | Landline | Utica |
| 815-692 | Frontier | Landline | Fairbury |
| 815-693 | T-Mobile | Wireless | Joliet |
| 815-694 | Frontier | Landline | Clifton |
| 815-695 | AT&T (IL Bell) | Landline | Newark |
| 815-696 | Aero North Communications | Landline | Roscoe |
| 815-697 | Frontier | Landline | Chebanse |
| 815-698 | Frontier | Landline | Ashkum |
| 815-699 | Frontier | Landline | Wyanet |
| 815-700 | Landline | ||
| 815-701 | Lumen/Level 3 | Landline | Woodstock |
| 815-702 | CenturyLink | Landline | Saunemin |
| 815-703 | T-Mobile | Wireless | Rockford |
| 815-704 | Paetec Itel | Landline | So Beloit |
| 815-705 | Teleport Communications America | Landline | Morris |
| 815-706 | Exiant Communications | Landline | Rockford |
| 815-707 | Lumen/Level 3 | Landline | Gilman |
| 815-708 | Comcast | Landline | Rockford |
| 815-709 | Lumen/Level 3 | Landline | Coal City |
| 815-710 | Teleport Communications America | Landline | Morris |
| 815-711 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-712 | Metro by T-Mobile | Wireless | La Salle |
| 815-713 | AT&T Mobility | Wireless | Rockford |
| 815-714 | Bandwidth.com | Landline | Joliet |
| 815-715 | AT&T Mobility | Wireless | Joliet |
| 815-716 | Metro by T-Mobile | Wireless | Sterling |
| 815-717 | First Communications | Landline | New Lenox |
| 815-718 | US Cellular | Wireless | Sterling |
| 815-719 | Metro by T-Mobile | Wireless | Princeton |
| 815-720 | AT&T (IL Bell) | Landline | Rockford |
| 815-721 | Teleport Communications America | Landline | Rockford |
| 815-722 | AT&T (IL Bell) | Landline | Joliet |
| 815-723 | AT&T (IL Bell) | Landline | Joliet |
| 815-724 | AT&T (IL Bell) | Landline | Joliet |
| 815-725 | AT&T (IL Bell) | Landline | Joliet |
| 815-726 | AT&T (IL Bell) | Landline | Joliet |
| 815-727 | AT&T (IL Bell) | Landline | Joliet |
| 815-728 | Frontier | Landline | Wonderlake |
| 815-729 | AT&T (IL Bell) | Landline | Joliet |
| 815-730 | AT&T (IL Bell) | Landline | Joliet |
| 815-731 | AT&T (IL Bell) | Landline | Plainfield |
| 815-732 | Frontier | Landline | Oregon |
| 815-733 | Rcn Telecom Services Of Illinios | Landline | Plainfield |
| 815-734 | Frontier | Landline | Mt Morris |
| 815-735 | AT&T Mobility | Wireless | Joliet |
| 815-736 | AT&T (IL Bell) | Landline | Lisbon |
| 815-737 | Sharon Tel. Co. - Il | Landline | So Sharon |
| 815-738 | Leaf River Telephone Co | Landline | Leaf River |
| 815-739 | Metro by T-Mobile | Wireless | Sycamore |
| 815-740 | AT&T (IL Bell) | Landline | Joliet |
| 815-741 | AT&T (IL Bell) | Landline | Joliet |
| 815-742 | US Cellular | Wireless | Rockford |
| 815-743 | Frontier | Landline | Graymont |
| 815-744 | AT&T (IL Bell) | Landline | Joliet |
| 815-745 | Frontier | Landline | Warren |
| 815-746 | Marseilles Tel. Co. Of Marseilles | Landline | Marseilles |
| 815-747 | Frontier | Landline | E Dubuque |
| 815-748 | Frontier | Landline | De Kalb |
| 815-749 | Bandwidth.com | Landline | Lockport |
| 815-750 | Mtco Communications | Landline | Marseilles |
| 815-751 | Verizon Wireless | Wireless | De Kalb |
| 815-752 | Frontier | Landline | De Kalb |
| 815-753 | Frontier | Landline | De Kalb |
| 815-754 | Frontier | Landline | De Kalb |
| 815-755 | Onvoy | Landline | Seneca |
| 815-756 | Frontier | Landline | De Kalb |
| 815-757 | US Cellular | Wireless | De Kalb |
| 815-758 | Frontier | Landline | De Kalb |
| 815-759 | AT&T (IL Bell) | Landline | Mchenry |
| 815-760 | Verizon Wireless | Wireless | Bureau |
| 815-761 | Verizon Wireless | Wireless | De Kalb |
| 815-762 | Verizon Wireless | Wireless | De Kalb |
| 815-763 | Verizon Wireless | Wireless | Joliet |
| 815-764 | US Cellular | Wireless | De Kalb |
| 815-765 | Frontier | Landline | Poplar Grv |
| 815-766 | US Cellular | Wireless | De Kalb |
| 815-767 | American Messaging Services | Landline | La Grange |
| 815-768 | AT&T (IL Bell) | Landline | Joliet |
| 815-769 | Lumen/Level 3 | Landline | Seneca |
| 815-770 | Spectrum | Landline | Harvard |
| 815-771 | Rcn Telecom Services Of Illinios | Landline | Ashkum |
| 815-772 | Frontier | Landline | Morrison |
| 815-773 | AT&T (IL Bell) | Landline | Joliet |
| 815-774 | AT&T (IL Bell) | Landline | Joliet |
| 815-775 | Usa Mobility Wireless | Wireless | Woodstock |
| 815-776 | AT&T (IL Bell) | Landline | Galena |
| 815-777 | AT&T (IL Bell) | Landline | Galena |
| 815-778 | Frontier | Landline | Lyndon |
| 815-779 | T-Mobile | Wireless | Plainfield |
| 815-780 | Lumen/Level 3 | Landline | La Salle |
| 815-781 | Rcn Telecom Services Of Illinios | Landline | Chebanse |
| 815-782 | Lumen/Level 3 | Landline | Plainfield |
| 815-783 | Rcn Telecom Services Of Illinios | Landline | Gilman |
| 815-784 | Frontier | Landline | Genoa |
| 815-785 | Rcn Telecom Services Of Illinios | Landline | Watseka |
| 815-786 | Frontier | Landline | Sandwich |
| 815-787 | Frontier | Landline | De Kalb |
| 815-788 | AT&T (IL Bell) | Landline | Crystal Lk |
| 815-789 | Frontier | Landline | Orangevl |
| 815-790 | T-Mobile | Wireless | Woodstock |
| 815-791 | T-Mobile | Wireless | Joliet |
| 815-792 | AT&T (IL Bell) | Landline | Harding |
| 815-793 | T-Mobile | Wireless | De Kalb |
| 815-794 | Marseilles Tel. Co. Of Marseilles | Landline | Marseilles |
| 815-795 | Marseilles Tel. Co. Of Marseilles | Landline | Marseilles |
| 815-796 | Frontier | Landline | Flanagan |
| 815-797 | Lumen/Level 3 | Landline | Somonauk |
| 815-798 | Aero North Communications | Landline | Milledgevl |
| 815-799 | Lumen/Level 3 | Landline | Manlius |
| 815-800 | Mediacom Telephony Of Illinois | Landline | Poplar Grv |
| 815-801 | Aero North Communications | Landline | Freeport |
| 815-802 | AT&T (IL Bell) | Landline | Kankakee |
| 815-803 | Aero North Communications | Landline | Byron |
| 815-804 | Aero North Communications | Landline | Pecatonica |
| 815-805 | Aero North Communications | Landline | Durand |
| 815-806 | AT&T (IL Bell) | Landline | Frankfort |
| 815-807 | Aero North Communications | Landline | German Vly |
| 815-808 | Aero North Communications | Landline | Winslow |
| 815-809 | Aero North Communications | Landline | Lena |
| 815-810 | Aero North Communications | Landline | Pearl City |
| 815-811 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-812 | Aero North Communications | Landline | Dakota |
| 815-813 | Aero North Communications | Landline | Appleriver |
| 815-814 | T-Mobile | Wireless | Woodstock |
| 815-815 | Spectrum | Landline | Ladd |
| 815-816 | Aero North Communications | Landline | Cedarville |
| 815-817 | Aero North Communications | Landline | Hanover |
| 815-818 | Aero North Communications | Landline | Warren |
| 815-819 | Aero North Communications | Landline | Orangevl |
| 815-820 | Aero North Communications | Landline | Elizabeth |
| 815-821 | US Cellular | Wireless | Freeport |
| 815-822 | AT&T Mobility | Wireless | Streator |
| 815-823 | T-Mobile | Wireless | Joliet |
| 815-824 | Frontier | Landline | Shabbona |
| 815-825 | Frontier | Landline | Malta |
| 815-826 | Verizon Wireless | Wireless | Somonauk |
| 815-827 | Frontier | Landline | Maple Park |
| 815-828 | MCI/Verizon | Wireless | Minooka |
| 815-829 | Aero North Communications | Landline | Chadwick |
| 815-830 | AT&T Mobility | Wireless | Oglesby |
| 815-831 | Aero North Communications | Landline | Davis |
| 815-832 | Frontier | Landline | Saunemin |
| 815-833 | Aero North Communications | Landline | Mcconnell |
| 815-834 | AT&T (IL Bell) | Landline | Lockport |
| 815-835 | Aero North Communications | Landline | Dixon |
| 815-836 | AT&T (IL Bell) | Landline | Lockport |
| 815-837 | Aero North Communications | Landline | Forreston |
| 815-838 | AT&T (IL Bell) | Landline | Lockport |
| 815-839 | MCI/Verizon | Wireless | Kankakee |
| 815-840 | Aero North Communications | Landline | Stockton |
| 815-841 | Aero North Communications | Landline | Mt Morris |
| 815-842 | Frontier | Landline | Pontiac |
| 815-843 | Aero North Communications | Landline | Ashton |
| 815-844 | Frontier | Landline | Pontiac |
| 815-845 | Frontier | Landline | Scalesmond |
| 815-846 | Lumen/Level 3 | Landline | Joliet |
| 815-847 | AT&T | Landline | Rockford |
| 815-848 | Verizon Wireless | Wireless | Pontiac |
| 815-849 | Frontier | Landline | Sublette |
| 815-850 | Aero North Communications | Landline | Seward |
| 815-851 | Usa Mobility Wireless | Wireless | Kankakee |
| 815-852 | Aero North Communications | Landline | Scalesmond |
| 815-853 | Frontier | Landline | Wenona |
| 815-854 | Frontier | Landline | Long Point |
| 815-855 | Mediacom Telephony Of Illinois | Landline | Milledgevl |
| 815-856 | Leonore Mutual Tel. Co | Landline | Leonore |
| 815-857 | Frontier | Landline | Amboy |
| 815-858 | Frontier | Landline | Elizabeth |
| 815-859 | Vonage | Landline | Rochelle |
| 815-860 | Teleport Communications America | Landline | Elwood |
| 815-861 | AT&T Mobility | Wireless | Woodstock |
| 815-862 | Spectrum | Landline | Richmond |
| 815-863 | Frontier | Landline | Rutland |
| 815-864 | Frontier | Landline | Shannon |
| 815-865 | Frontier | Landline | Davis |
| 815-866 | Verizon Wireless | Wireless | Princeton |
| 815-867 | T-Mobile | Wireless | Pontiac |
| 815-868 | Frontier | Landline | Mcconnell |
| 815-869 | Frontier | Landline | Magnolia |
| 815-870 | Usa Mobility Wireless | Wireless | Rockford |
| 815-871 | US Cellular | Wireless | Rockford |
| 815-872 | Frontier | Landline | Princeton |
| 815-873 | Frontier | Landline | Newmilford |
| 815-874 | Frontier | Landline | Newmilford |
| 815-875 | Frontier | Landline | Princeton |
| 815-876 | Frontier | Landline | Princeton |
| 815-877 | AT&T (IL Bell) | Landline | Rockford |
| 815-878 | AT&T Mobility | Wireless | Princeton |
| 815-879 | Frontier | Landline | Princeton |
| 815-880 | MCI/Verizon | Wireless | Woodstock |
| 815-881 | Lumen/Level 3 | Landline | Oregon |
| 815-882 | Mcnabb Tel. Co | Landline | Mcnabb |
| 815-883 | AT&T (IL Bell) | Landline | Oglesby |
| 815-884 | Mcc Telephony | Landline | Earlville |
| 815-885 | Frontier | Landline | Rock Cut |
| 815-886 | AT&T (IL Bell) | Landline | Lockport |
| 815-887 | Teleport Communications America | Landline | Harvard |
| 815-888 | Lumen/Level 3 | Landline | Rochelle |
| 815-889 | Frontier | Landline | Milford |
| 815-890 | Aero North Communications | Landline | Newmilford |
| 815-891 | Aero North Communications | Landline | Winnebago |
| 815-892 | Teleport Communications America | Landline | Stilmanvly |
| 815-893 | Comcast | Landline | Crystal Lk |
| 815-894 | Frontier | Landline | Ladd |
| 815-895 | Frontier | Landline | Sycamore |
| 815-896 | Aero North Communications | Landline | Shirland |
| 815-897 | Mediacom Telephony Of Illinois | Landline | Lyndon |
| 815-898 | Aero North Communications | Landline | Massbach |
| 815-899 | Frontier | Landline | Sycamore |
| 815-900 | AT&T Mobility | Wireless | Mchenry |
| 815-901 | Comcast | Landline | De Kalb |
| 815-902 | Mediacom Telephony Of Illinois | Landline | Thomson |
| 815-903 | American Messaging Services | Landline | Mchenry |
| 815-904 | AT&T Mobility | Wireless | Rockford |
| 815-905 | Lumen/Level 3 | Landline | Lockport |
| 815-906 | Mediacom Telephony Of Illinois | Landline | Mt Carroll |
| 815-907 | Lumen/Level 3 | Landline | Manteno |
| 815-908 | Verizon Wireless | Wireless | Freeport |
| 815-909 | T-Mobile | Wireless | De Kalb |
| 815-910 | Verizon Wireless | Wireless | Mendota |
| 815-911 | Multiple Ocn Listing | Landline | Xxxxxxxxxx |
| 815-912 | Aero North Communications | Landline | Belvidere |
| 815-913 | CenturyLink | Landline | Chadwick |
| 815-914 | Metro by T-Mobile | Wireless | Rockford |
| 815-915 | Lumen/Level 3 | Landline | Princeton |
| 815-916 | Onvoy | Landline | Plattville |
| 815-917 | Aero North Communications | Landline | Rochelle |
| 815-918 | Lumen/Level 3 | Landline | Clifton |
| 815-919 | T-Mobile | Wireless | Joliet |
| 815-920 | Mediacom Telephony Of Illinois | Landline | Cornell |
| 815-921 | AT&T (IL Bell) | Landline | Rockford |
| 815-922 | Verizon Wireless | Wireless | Kankakee |
| 815-923 | AT&T (IL Bell) | Landline | Union |
| 815-924 | Aero North Communications | Landline | Prophetstn |
| 815-925 | Frontier | Landline | Hennepin |
| 815-926 | Lumen/Level 3 | Landline | Wilmington |
| 815-927 | Lumen/Level 3 | Landline | Joliet |
| 815-928 | AT&T (IL Bell) | Landline | Kankakee |
| 815-929 | AT&T (IL Bell) | Landline | Kankakee |
| 815-930 | Mediacom Telephony Of Illinois | Landline | Elizabeth |
| 815-931 | AT&T Mobility | Wireless | Joliet |
| 815-932 | AT&T (IL Bell) | Landline | Kankakee |
| 815-933 | AT&T (IL Bell) | Landline | Kankakee |
| 815-934 | Frontier | Landline | Emington |
| 815-935 | AT&T (IL Bell) | Landline | Kankakee |
| 815-936 | AT&T (IL Bell) | Landline | Kankakee |
| 815-937 | AT&T (IL Bell) | Landline | Kankakee |
| 815-938 | Frontier | Landline | Forreston |
| 815-939 | AT&T (IL Bell) | Landline | Kankakee |
| 815-940 | Lumen/Level 3 | Landline | Gardner |
| 815-941 | AT&T (IL Bell) | Landline | Morris |
| 815-942 | AT&T (IL Bell) | Landline | Morris |
| 815-943 | AT&T (IL Bell) | Landline | Harvard |
| 815-944 | AT&T (IL Bell) | Landline | Momence |
| 815-945 | Frontier | Landline | Chenoa |
| 815-946 | Frontier | Landline | Polo |
| 815-947 | Frontier | Landline | Stockton |
| 815-948 | Frontier | Landline | Hooppole |
| 815-949 | Frontier | Landline | Cabery |
| 815-950 | Landline | ||
| 815-951 | Aero North Communications | Landline | Amboy |
| 815-952 | Aero North Communications | Landline | Lanark |
| 815-953 | Verizon Wireless | Wireless | Kankakee |
| 815-954 | Verizon Wireless | Wireless | Kankakee |
| 815-955 | Metro by T-Mobile | Wireless | Joliet |
| 815-956 | Frontier | Landline | Morrison |
| 815-957 | Lumen/Level 3 | Landline | Rockton |
| 815-958 | Landline | ||
| 815-959 | Landline | ||
| 815-960 | North County Communication Corporation - Ca | Landline | Leaf River |
| 815-961 | AT&T (IL Bell) | Landline | Rockford |
| 815-962 | AT&T (IL Bell) | Landline | Rockford |
| 815-963 | AT&T (IL Bell) | Landline | Rockford |
| 815-964 | AT&T (IL Bell) | Landline | Rockford |
| 815-965 | AT&T (IL Bell) | Landline | Rockford |
| 815-966 | AT&T (IL Bell) | Landline | Rockford |
| 815-967 | AT&T (IL Bell) | Landline | Rockford |
| 815-968 | AT&T (IL Bell) | Landline | Rockford |
| 815-969 | AT&T (IL Bell) | Landline | Rockford |
| 815-970 | Metro by T-Mobile | Wireless | Sycamore |
| 815-971 | AT&T (IL Bell) | Landline | Rockford |
| 815-972 | AT&T (IL Bell) | Landline | Rockford |
| 815-973 | US Cellular | Wireless | Dixon |
| 815-974 | Onvoy | Landline | Hebron |
| 815-975 | AT&T Mobility | Wireless | Belvidere |
| 815-976 | Landline | ||
| 815-977 | MCI/Verizon | Wireless | Rockford |
| 815-978 | Verizon Wireless | Wireless | Rockford |
| 815-979 | Verizon Wireless | Wireless | Rockford |
| 815-980 | Verizon Wireless | Wireless | Rockford |
| 815-981 | Lumen/Level 3 | Landline | De Kalb |
| 815-982 | Mediacom Telephony Of Illinois | Landline | Tampico |
| 815-983 | American Messaging Services | Landline | Rockford |
| 815-984 | Frontier | Landline | Wellington |
| 815-985 | Verizon Wireless | Wireless | Rockford |
| 815-986 | Paetec Itel | Landline | Rockford |
| 815-987 | AT&T (IL Bell) | Landline | Rockford |
| 815-988 | US Cellular | Wireless | Rockford |
| 815-989 | Mediacom Telephony Of Illinois | Landline | Prophetstn |
| 815-990 | Verizon Wireless | Wireless | Freeport |
| 815-991 | AT&T Mobility | Wireless | Sycamore |
| 815-992 | T-Mobile | Wireless | Streator |
| 815-993 | AT&T Mobility | Wireless | Oglesby |
| 815-994 | Metro by T-Mobile | Wireless | Dixon |
| 815-995 | Teleport Communications America | Landline | De Kalb |
| 815-996 | CenturyLink | Landline | Savanna |
| 815-997 | Paetec Itel | Landline | Rockford |
| 815-998 | Frontier | Landline | Odell |
| 815-999 | T-Mobile | Wireless | Joliet |
Overlay Area Codes
All 17 area codes in Illinois
About Area Code 815
Area code 815 has been around since 1947, one of the original codes that helped wire up the phone lines across the US. Back then, folks in northern Illinois were dealing with post-war growth, and this code stepped in to cover the calls from Rockford and its neighbors. It's all about that central time zone, ticking along at UTC-6, which means you're sharing the clock with Chicago without being smack in the big city hustle. Over the years, 815 has spread across 18 cities, from Belvidere up north to Joliet down south, painting a picture of small-town charm mixed with some urban edge. Take Rockford, for instance—it's the heart of this area, where manufacturing plants hum and rivers wind through the scene. This code got an overlay buddy in 779 back in 2010, splitting the load as more people needed lines for work and family chats. What sets 815 apart is its mix of rural roots and industrial spirit; think cornfields giving way to factories in places like DeKalb or Freeport. It's not just about numbers—it's the stories of communities that grew with it, from farmers coordinating harvests to families keeping in touch across the Illinois plains. With its original status, 815 stands as a steady presence, serving folks who value their local ties while reaching out to the wider world.
⚠ Scam & Spam Alert for 815
If you're in the 815 area, you might get calls that seem off, like someone claiming to be from the IRS demanding payment right away. That's a classic scam, where they threaten fines or arrest if you don't wire money. Then there's the auto warranty racket, with smooth talkers pushing extended coverage for a car you don't even own anymore. Medicare fraud hits hard too, especially among older residents, with fraudsters pretending to update records and asking for personal details. These calls can be persistent, but don't panic—they're just trying to trick you. Remember, real agencies don't call demanding immediate action over the phone. One simple tip: Hang up and call back the official number yourself to verify anything suspicious. Staying cautious helps keep your info safe without letting fear take over.
Local Snapshot
Rockford's population hovers around 150,000, making it a mid-sized hub in northern Illinois with plenty of community spirit. Manufacturing drives the local economy, from machine tools to automotive parts, keeping jobs steady for thousands of workers. The area is famous for its baseball history, like the Rockford Peaches from that old movie—a nod to women's contributions in sports back in the day. And here's a quirky fact: Illinois has more wind turbines per square mile in some spots, helping power homes around 815 with clean energy that surprises even the locals.
Frequently Asked Questions
Where is area code 815?
Area code 815 serves Rockford and surrounding communities in Illinois, including Belvidere, Bolingbrook, Channahon, Crystal Lake, DeKalb and 13 more. It is in the Central time zone.
What cities are in area code 815?
Area code 815 covers 18 cities in Illinois: Belvidere, Bolingbrook, Channahon, Crystal Lake, DeKalb, Freeport, Joliet, Kankakee, Lockport, McHenry, and 8 more
What time zone is 815?
Area code 815 is in the Central time zone (UTC-6).
When was area code 815 created?
Area code 815 is one of the original area codes established in 1947 as part of the North American Numbering Plan.
Is 815 a legitimate area code?
Yes, 815 is a valid, active area code assigned to Rockford, Illinois. However, scammers can spoof any area code, so receiving a call from 815 doesn't guarantee the caller is actually in this area.
What area codes overlap with 815?
Area code 815 shares its geographic area with overlay code 779. This means all local calls in the area require 10-digit dialing.
What role did the establishment of the 815 area code play in northern Illinois' post-WWII growth?
The 815 area code was introduced in 1947 to support expanding telephone needs in northern Illinois as the region recovered from World War II. This helped accommodate population increases in cities like Rockford and Joliet. It marked a key step in modernizing communication for local industries and communities.
Which cities in the 815 area code have significant manufacturing heritage?
Rockford stands out for its long history in manufacturing, particularly in machinery and tools, drawing from its industrial roots. DeKalb and Freeport also feature manufacturing facilities that have shaped their economies. These cities have relied on such industries for job creation and economic stability.
Has the 815 area code experienced any changes since its creation?
The 815 area code, established in 1947, has undergone overlays like the addition of 779 in 2017 to handle growing demand in the same region. This change affects cities such as Crystal Lake and Bolingbrook by providing more phone numbers. It reflects the ongoing development in northern Illinois' telecommunications.