Aurora, Illinois
Illinois · Central (UTC-6) · — · 16 cities
Cities Served by Area Code 331 (16 cities)
Additional Details
About Area Code 331
Area code 331 was introduced in 2007 as an overlay code, sharing the same geographic region as an existing area code to meet growing demand for phone numbers in the Aurora area. The area is in the Central time zone. It covers 16 cities and communities including Aurora, Batavia, Carol Stream, Downers Grove, Elmhurst and 11 more.
Phone Number Prefixes in Area Code 331
236 active NXX prefixes — 45% wireless, 55% landline. Each prefix (NXX) represents up to 10,000 phone numbers.
| Prefix | Carrier | Type | Rate Center |
|---|---|---|---|
| 331-200 | T-Mobile | Wireless | Bartlett |
| 331-201 | Verizon Wireless | Wireless | Downersgrv |
| 331-202 | Metro by T-Mobile | Wireless | Elmhurst |
| 331-203 | T-Mobile | Wireless | Aurora |
| 331-204 | Onvoy | Landline | Naperville |
| 331-205 | T-Mobile | Wireless | Aurora |
| 331-206 | T-Mobile | Wireless | Aurora |
| 331-207 | Lumen/Level 3 | Landline | Yorkville |
| 331-208 | T-Mobile | Wireless | Aurora |
| 331-209 | Lumen/Level 3 | Landline | Elmhurst |
| 331-210 | Peerless Network Of Illinois | Landline | St Charles |
| 331-211 | Multiple Ocn Listing | Landline | |
| 331-212 | MCI/Verizon | Wireless | Aurora |
| 331-213 | Verizon Wireless | Wireless | Naperville |
| 331-214 | Verizon Wireless | Wireless | Downersgrv |
| 331-215 | Verizon Wireless | Wireless | Naperville |
| 331-216 | AT&T Mobility | Wireless | Oswego |
| 331-217 | Onvoy | Landline | Lombard |
| 331-218 | T-Mobile | Wireless | Wheaton |
| 331-219 | Telnyx | Landline | Aurora |
| 331-220 | T-Mobile | Wireless | Aurora |
| 331-221 | AT&T (IL Bell) | Landline | Elmhurst |
| 331-222 | AT&T Mobility | Wireless | St Charles |
| 331-223 | AT&T Mobility | Wireless | St Charles |
| 331-224 | Onvoy | Landline | Itasca |
| 331-225 | Metro by T-Mobile | Wireless | Elmhurst |
| 331-226 | T-Mobile | Wireless | Naperville |
| 331-227 | Verizon Wireless | Wireless | Sugargrove |
| 331-228 | Paetec Itel | Landline | St Charles |
| 331-229 | Verizon Wireless | Wireless | Naperville |
| 331-230 | T-Mobile | Wireless | Aurora |
| 331-231 | AT&T Mobility | Wireless | Naperville |
| 331-232 | AT&T Mobility | Wireless | W Chicago |
| 331-233 | Telnyx | Landline | Downersgrv |
| 331-234 | Verizon Wireless | Wireless | Sugargrove |
| 331-235 | AT&T Mobility | Wireless | St Charles |
| 331-236 | T-Mobile | Wireless | Wheaton |
| 331-237 | MCI/Verizon | Wireless | Naperville |
| 331-238 | Teleport Communications America | Landline | Downersgrv |
| 331-239 | Onvoy | Landline | Yorkville |
| 331-240 | Peerless Network Of Illinois | Landline | W Chicago |
| 331-241 | Onvoy | Landline | Lombard |
| 331-242 | T-Mobile | Wireless | Lombard |
| 331-243 | T-Mobile | Wireless | Lombard |
| 331-244 | Onvoy | Landline | Naperville |
| 331-245 | T-Mobile | Wireless | Bartlett |
| 331-246 | T-Mobile | Wireless | Lemont |
| 331-247 | Vonage | Landline | Naperville |
| 331-248 | Comcast | Landline | Geneva |
| 331-249 | Onvoy | Landline | Naperville |
| 331-250 | T-Mobile | Wireless | Aurora |
| 331-251 | Verizon Wireless | Wireless | Downersgrv |
| 331-252 | Teleport Communications America | Landline | Warrenvl |
| 331-253 | T-Mobile | Wireless | Lemont |
| 331-254 | T-Mobile | Wireless | Sugargrove |
| 331-255 | Onvoy | Landline | Aurora |
| 331-256 | Verizon Wireless | Wireless | Aurora |
| 331-257 | AT&T Mobility | Wireless | Aurora |
| 331-258 | Onvoy | Landline | Aurora |
| 331-259 | Peerless Network Of Illinois | Landline | Sugargrove |
| 331-260 | Teleport Communications America | Landline | Downersgrv |
| 331-261 | T-Mobile | Wireless | Lemont |
| 331-262 | T-Mobile | Wireless | Aurora |
| 331-263 | Onvoy | Landline | Itasca |
| 331-264 | Lumen/Level 3 | Landline | Hinsdale |
| 331-265 | Onvoy | Landline | Geneva |
| 331-266 | AT&T Mobility | Wireless | St Charles |
| 331-267 | Vonage | Landline | Lombard |
| 331-268 | T-Mobile | Wireless | Sugargrove |
| 331-269 | T-Mobile | Wireless | Aurora |
| 331-270 | Onvoy | Landline | Aurora |
| 331-271 | Onvoy | Landline | Hinsdale |
| 331-272 | Onvoy | Landline | St Charles |
| 331-273 | Onvoy | Landline | Lemont |
| 331-274 | T-Mobile | Wireless | Aurora |
| 331-275 | T-Mobile | Wireless | Bartlett |
| 331-276 | Verizon Wireless | Wireless | St Charles |
| 331-277 | AT&T Mobility | Wireless | Lombard |
| 331-278 | AT&T Mobility | Wireless | Aurora |
| 331-279 | Paetec Itel | Landline | Elmhurst |
| 331-280 | Verizon Wireless | Wireless | Downersgrv |
| 331-281 | AT&T (IL Bell) | Landline | Naperville |
| 331-282 | Onvoy | Landline | Hinsdale |
| 331-283 | T-Mobile | Wireless | Geneva |
| 331-284 | T-Mobile | Wireless | Bartlett |
| 331-285 | Verizon Wireless | Wireless | Naperville |
| 331-286 | Verizon Wireless | Wireless | St Charles |
| 331-287 | Bandwidth.com | Landline | Aurora |
| 331-288 | Ton80 Communications | Landline | Elburn |
| 331-289 | T-Mobile | Wireless | Hinsdale |
| 331-290 | Verizon Wireless | Wireless | Aurora |
| 331-291 | Verizon Wireless | Wireless | Downersgrv |
| 331-292 | Spectrum | Landline | Downersgrv |
| 331-293 | AT&T Mobility | Wireless | Aurora |
| 331-294 | Verizon Wireless | Wireless | Naperville |
| 331-295 | Nuso | Landline | Aurora |
| 331-296 | Boost Subscriberco | Wireless | Wheaton |
| 331-297 | Onvoy | Landline | Batavia |
| 331-298 | Onvoy | Landline | Naperville |
| 331-299 | Fractel | Landline | Hinsdale |
| 331-300 | T-Mobile | Wireless | Aurora |
| 331-301 | Metro by T-Mobile | Wireless | Aurora |
| 331-302 | Verizon Wireless | Wireless | Aurora |
| 331-303 | Bandwidth.com | Landline | Elburn |
| 331-304 | T-Mobile | Wireless | Bartlett |
| 331-305 | Verizon Wireless | Wireless | Naperville |
| 331-306 | Onvoy | Landline | Downersgrv |
| 331-307 | T-Mobile | Wireless | Lombard |
| 331-308 | Bandwidth.com | Landline | Bartlett |
| 331-309 | Commio | Landline | Lemont |
| 331-310 | Bandwidth.com | Landline | Big Rock |
| 331-311 | Multiple Ocn Listing | Landline | |
| 331-312 | Verizon Wireless | Wireless | Aurora |
| 331-313 | Spectrum | Landline | Naperville |
| 331-314 | Verizon Wireless | Wireless | St Charles |
| 331-315 | AT&T Mobility | Wireless | Lombard |
| 331-316 | Commio | Landline | Naperville |
| 331-317 | Commio | Landline | Hinsdale |
| 331-318 | Bandwidth.com | Landline | Lemont |
| 331-319 | Onvoy | Landline | Aurora |
| 331-320 | Onvoy | Landline | Bartlett |
| 331-321 | T-Mobile | Wireless | Aurora |
| 331-322 | Onvoy | Landline | Lombard |
| 331-323 | Onvoy | Landline | Glen Ellyn |
| 331-324 | Onvoy | Landline | Yorkville |
| 331-325 | Spectrum | Landline | Lemont |
| 331-326 | Onvoy | Landline | Downersgrv |
| 331-327 | Verizon Wireless | Wireless | St Charles |
| 331-328 | AT&T Mobility | Wireless | Naperville |
| 331-329 | Onvoy | Landline | Aurora |
| 331-330 | AT&T Mobility | Wireless | Naperville |
| 331-331 | Onvoy | Landline | Aurora |
| 331-332 | AT&T Mobility | Wireless | Naperville |
| 331-333 | AT&T Mobility | Wireless | Naperville |
| 331-334 | Onvoy | Landline | Batavia |
| 331-335 | AT&T Mobility | Wireless | St Charles |
| 331-336 | Fractel | Landline | Aurora |
| 331-337 | AT&T Mobility | Wireless | Oswego |
| 331-338 | Spectrum | Landline | Aurora |
| 331-339 | Verizon Wireless | Wireless | Aurora |
| 331-340 | Onvoy | Landline | Itasca |
| 331-341 | Onvoy | Landline | Plano |
| 331-342 | Verizon Wireless | Wireless | Naperville |
| 331-343 | Onvoy | Landline | Downersgrv |
| 331-344 | Onvoy | Landline | W Chicago |
| 331-345 | Fractel | Landline | Naperville |
| 331-348 | Fractel | Landline | Elburn |
| 331-356 | Fractel | Landline | Bartlett |
| 331-373 | Ton80 Communications | Landline | Oswego |
| 331-385 | AT&T Mobility | Wireless | Aurora |
| 331-388 | Fractel | Landline | Sugargrove |
| 331-399 | Fractel | Landline | Downersgrv |
| 331-400 | Fractel | Landline | Oswego |
| 331-401 | Lumen/Level 3 | Landline | Naperville |
| 331-411 | Multiple Ocn Listing | Landline | |
| 331-422 | Lumen/Level 3 | Landline | St Charles |
| 331-425 | T-Mobile | Wireless | Aurora |
| 331-426 | Ton80 Communications | Landline | Lemont |
| 331-431 | Bandwidth.com | Landline | Aurora |
| 331-442 | Verizon Wireless | Wireless | St Charles |
| 331-444 | Verizon Wireless | Wireless | Naperville |
| 331-452 | Verizon Wireless | Wireless | Aurora |
| 331-454 | AT&T Mobility | Wireless | Aurora |
| 331-456 | First Communications | Landline | Roselle |
| 331-457 | Verizon Wireless | Wireless | Naperville |
| 331-462 | MCI/Verizon | Wireless | Lombard |
| 331-465 | AT&T Mobility | Wireless | W Chicago |
| 331-466 | Ton80 Communications | Landline | Glen Ellyn |
| 331-472 | T-Mobile | Wireless | Naperville |
| 331-481 | Verizon Wireless | Wireless | Downersgrv |
| 331-500 | Fractel | Landline | Geneva |
| 331-511 | Multiple Ocn Listing | Landline | |
| 331-529 | Fractel | Landline | Naperville |
| 331-551 | AT&T Mobility | Wireless | Lombard |
| 331-555 | Multiple Ocn Listing | Landline | |
| 331-575 | T-Mobile | Wireless | Aurora |
| 331-588 | AT&T Mobility | Wireless | St Charles |
| 331-591 | Landline | ||
| 331-600 | Fractel | Landline | Wheaton |
| 331-611 | Multiple Ocn Listing | Landline | |
| 331-625 | Verizon Wireless | Wireless | Downersgrv |
| 331-627 | Ton80 Communications | Landline | Lombard |
| 331-631 | Spectrum | Landline | Downersgrv |
| 331-642 | Bandwidth.com | Landline | Elmhurst |
| 331-643 | Metro by T-Mobile | Wireless | Aurora |
| 331-645 | Metro by T-Mobile | Wireless | Elmhurst |
| 331-666 | Onvoy | Landline | Aurora |
| 331-684 | Rcn Telecom Services Of Illinios | Landline | Aurora |
| 331-688 | Ton80 Communications | Landline | Naperville |
| 331-700 | Landline | ||
| 331-701 | Verizon Wireless | Wireless | Naperville |
| 331-702 | MCI/Verizon | Wireless | Naperville |
| 331-703 | T-Mobile | Wireless | W Chicago |
| 331-704 | Bandwidth.com | Landline | Kaneville |
| 331-707 | T-Mobile | Wireless | Aurora |
| 331-711 | Multiple Ocn Listing | Landline | |
| 331-716 | Onvoy | Landline | Wheaton |
| 331-717 | AT&T Mobility | Wireless | Oswego |
| 331-725 | AT&T Mobility | Wireless | Oswego |
| 331-732 | Fractel | Landline | Geneva |
| 331-746 | Ton80 Communications | Landline | Kaneville |
| 331-757 | T-Mobile | Wireless | Lemont |
| 331-758 | Fractel | Landline | Aurora |
| 331-771 | Onvoy | Landline | St Charles |
| 331-775 | Comcast | Landline | Downersgrv |
| 331-777 | Verizon Wireless | Wireless | Downersgrv |
| 331-788 | Fractel | Landline | Geneva |
| 331-800 | Onvoy | Landline | W Chicago |
| 331-801 | Teleport Communications America | Landline | Downersgrv |
| 331-803 | Peerless Network Of Illinois | Landline | Lemont |
| 331-806 | Comcast | Landline | Wheaton |
| 331-808 | Bandwidth.com | Landline | Plano |
| 331-811 | Multiple Ocn Listing | Landline | |
| 331-814 | T-Mobile | Wireless | Naperville |
| 331-825 | Digital Network Access Communications | Landline | Geneva |
| 331-826 | Metro by T-Mobile | Wireless | Elmhurst |
| 331-837 | Ton80 Communications | Landline | W Chicago |
| 331-850 | Onvoy | Landline | Big Rock |
| 331-866 | Ton80 Communications | Landline | Wheaton |
| 331-867 | Fractel | Landline | Yorkville |
| 331-871 | Onvoy | Landline | W Chicago |
| 331-888 | Peerless Network Of Illinois | Landline | Warrenvl |
| 331-899 | Fractel | Landline | Lombard |
| 331-900 | Fractel | Landline | Elmhurst |
| 331-901 | Bandwidth.com | Landline | St Charles |
| 331-903 | AT&T | Landline | Downersgrv |
| 331-911 | Multiple Ocn Listing | Landline | |
| 331-946 | Fractel | Landline | Glen Ellyn |
| 331-950 | Landline | ||
| 331-958 | Landline | ||
| 331-959 | Landline | ||
| 331-976 | Landline | ||
| 331-979 | Comcast | Landline | Elmhurst |
| 331-980 | T-Mobile | Wireless | Aurora |
| 331-998 | Verizon Wireless | Wireless | Downersgrv |
| 331-999 | Bandwidth.com | Landline | Oswego |
All 17 area codes in Illinois
About Area Code 331
Area code 331 showed up in 2007, right when Illinois' suburbs were booming. Picture this: Aurora, that lively spot west of Chicago, was growing fast with new families moving in and businesses popping up everywhere. The old area code, 630, was running out of numbers, so 331 came along as an overlay to keep things going. That means if you're in Aurora or places like Batavia and Geneva, you might still have a 630 number, but now folks can snag a 331 one too without changing their location. It's all about handling the demand in this neck of the woods, where commuter trains zip people into the city and quiet neighborhoods blend with strip malls. With 16 cities under its belt, including spots like Downers Grove and Elmhurst, 331 covers a slice of northeastern Illinois that's all about that suburban vibe. Think family-friendly parks in Glen Ellyn or the historic charm of Lisle. What makes 331 stand out? It's not just another code; it's a sign of how these areas keep evolving, with new tech and services popping up to support the daily grind. Back then, the decision to add it was straightforward—more people meant more phones, and Illinois wasn't about to let anyone go without a line. So, whether you're calling about a local event in Carol Stream or chatting with neighbors in Elmhurst, 331 keeps the connections flowing in this Central Time Zone corner of the state.
⚠ Scam & Spam Alert for 331
If you're in the 331 area, you might get calls that sound official but are anything but. IRS scams are common around here, with callers pretending to be from the government and demanding immediate payment for supposed back taxes. Then there's the auto warranty racket, where someone claims your car's coverage is about to expire and pressures you to buy extended protection on the spot. Medicare fraud hits older residents hard, with scammers offering fake services or equipment to steal personal info. It's the same old tricks, but they keep trying. Don't fall for it; these calls often use spoofed numbers to look local. A simple tip: Always check the caller's identity yourself by looking up the official contact info and calling back directly. That way, you sidestep the hassle and keep your info safe.
Local Snapshot
Aurora's population hovers around 200,000, making it a solid hub in Illinois' suburbs. Manufacturing and logistics drive the economy here, with factories and warehouses keeping things humming along the interstates. The area's famous for its arts scene, like the Paramount Theatre, where you can catch a Broadway show without heading into Chicago. And here's a quirky fact: Aurora sits along the Fox River, which draws kayakers and fishers, turning this inland spot into a unexpected outdoor playground.
Frequently Asked Questions
What is the historical significance of Aurora in relation to area code 331?
Aurora, as the primary city for area code 331, played a key role in the region's growth that led to the code's establishment in 2007. The city has a strong railroad history, influencing its development and the need for additional phone numbers. This overlay helped accommodate the expanding population in the western Chicago suburbs.
How does the Central Time Zone impact daily life in the cities served by area code 331?
The Central Time Zone means residents in cities like Batavia and Geneva adjust clocks for daylight saving, affecting routines such as work and school schedules. This timezone aligns with major Midwest hubs, making coordination easier for local businesses and events. It also influences communication with other regions during standard time periods.
What local industries are prominent in the areas covered by area code 331?
Manufacturing and healthcare sectors are significant in places like Downers Grove and Elmhurst, drawing from the region's industrial roots. Educational institutions, such as those in Glen Ellyn, contribute to the local economy by providing jobs and training. These industries have grown since the area code's introduction, supporting the community's development.