331 Area Code
Area code 331 generally covers Montgomery, Naperville, and Woodridge in the U.S. State of Illinois.
Top cities in area code 331
| City | Prefixes |
|---|---|
| Montgomery, IL | 18.9% |
| Naperville, IL | 15.5% |
| Woodridge, IL | 9.5% |
| Saint Charles, IL | 8.1% |
| Lombard, IL | 6.1% |
| Elmhurst, IL | 6.1% |
| Lemont, IL | 4.1% |
| West Chicago, IL | 4.1% |
| Oswego, IL | 4.1% |
| Wheaton, IL | 3.4% |
Top telephone carriers in area code 331
| Carrier | Prefixes |
|---|---|
| T-Mobile | 16.9% |
| Verizon | 14.2% |
| New Cingular Wireless | 12.8% |
| Fractel | 11.5% |
| Onvoy | 8.1% |
| Sprint Spectrum | 7.4% |
| Bandwidth.com | 5.4% |
| Level 3 Communications | 3.4% |
| Comcast Phone Of Illinois | 2.7% |
| Teleport Communications America | 2.7% |
Area code 331 has 148 prefixes
| Prefix | Primary City | Usage | |
|---|---|---|---|
| 331-200 | Hanover Park | Wireless | T-Mobile |
| 331-201 | Woodridge | Wireless | Verizon |
| 331-202 | Elmhurst | Wireless | Sprint Spectrum |
| 331-203 | Montgomery | Wireless | Sprint Spectrum |
| 331-204 | Naperville | Landline | Onvoy |
| 331-205 | Montgomery | Wireless | T-Mobile |
| 331-206 | Montgomery | Wireless | Sprint Spectrum |
| 331-207 | Yorkville | Landline | Level 3 Communications |
| 331-208 | Montgomery | Wireless | Sprint Spectrum |
| 331-209 | Elmhurst | Wireless | Level 3 Communications |
| 331-210 | Saint Charles | Landline | Peerless Network Of Illinois |
| 331-212 | Montgomery | Landline | Mcimetro Access Transmission Services |
| 331-213 | Naperville | Wireless | Verizon |
| 331-214 | Woodridge | Wireless | Verizon |
| 331-215 | Naperville | Wireless | Verizon |
| 331-216 | Oswego | Wireless | New Cingular Wireless |
| 331-218 | Wheaton | Wireless | T-Mobile |
| 331-219 | Montgomery | Landline | Telnyx |
| 331-220 | Montgomery | Wireless | Sprint Spectrum |
| 331-221 | Elmhurst | Landline | Illinois Bell Tel |
| 331-222 | Saint Charles | Wireless | New Cingular Wireless |
| 331-223 | Saint Charles | Wireless | New Cingular Wireless |
| 331-225 | Elmhurst | Wireless | Sprint Spectrum |
| 331-226 | Naperville | Wireless | T-Mobile |
| 331-227 | Sugar Grove | Wireless | Verizon |
| 331-228 | Saint Charles | Wireless | Ovation Communications Of Illinois |
| 331-229 | Naperville | Wireless | Verizon |
| 331-230 | Montgomery | Wireless | T-Mobile |
| 331-231 | Oak Brook | Wireless | New Cingular Wireless |
| 331-232 | West Chicago | Wireless | New Cingular Wireless |
| 331-233 | Woodridge | Landline | Telnyx |
| 331-234 | Sugar Grove | Wireless | Verizon |
| 331-235 | Saint Charles | Wireless | New Cingular Wireless |
| 331-236 | Wheaton | Wireless | T-Mobile |
| 331-237 | Naperville | Landline | Mcimetro Access Transmission Services |
| 331-238 | Woodridge | Landline | Teleport Communications America |
| 331-239 | Yorkville | Landline | Onvoy |
| 331-240 | West Chicago | Landline | Peerless Network Of Illinois |
| 331-241 | Lombard | Landline | Intrado Communications |
| 331-242 | Lombard | Wireless | T-Mobile |
| 331-243 | Lombard | Wireless | T-Mobile |
| 331-244 | Naperville | Landline | Onvoy |
| 331-245 | Hanover Park | Wireless | T-Mobile |
| 331-246 | Lemont | Wireless | T-Mobile |
| 331-247 | Naperville | Landline | Vonage America |
| 331-248 | Geneva | Landline | Comcast Phone Of Illinois |
| 331-249 | Naperville | Landline | Onvoy |
| 331-250 | Montgomery | Wireless | T-Mobile |
| 331-251 | Woodridge | Wireless | Verizon |
| 331-252 | Warrenville | Landline | Teleport Communications America |
| 331-253 | Lemont | Wireless | T-Mobile |
| 331-254 | Sugar Grove | Wireless | T-Mobile |
| 331-255 | Montgomery | Landline | Onvoy |
| 331-256 | Montgomery | Wireless | Verizon |
| 331-257 | Naperville | Wireless | New Cingular Wireless |
| 331-260 | Woodridge | Landline | Teleport Communications America |
| 331-261 | Lemont | Wireless | T-Mobile |
| 331-262 | Montgomery | Wireless | Sprint Spectrum |
| 331-263 | Bensenville | Landline | Onvoy |
| 331-264 | Oak Brook | Landline | Level 3 Communications |
| 331-266 | Saint Charles | Wireless | New Cingular Wireless |
| 331-267 | Lombard | Landline | Vonage America |
| 331-271 | Oak Brook | Landline | Onvoy |
| 331-276 | Saint Charles | Wireless | Verizon |
| 331-281 | Naperville | Landline | Illinois Bell Tel |
| 331-299 | Oak Brook | Landline | Fractel |
| 331-300 | Montgomery | Wireless | T-Mobile |
| 331-301 | Montgomery | Landline | Local Access |
| 331-302 | Montgomery | Wireless | Verizon |
| 331-304 | Hanover Park | Wireless | T-Mobile |
| 331-305 | Naperville | Wireless | Verizon |
| 331-307 | Lombard | Wireless | T-Mobile |
| 331-308 | Hanover Park | Landline | Bandwidth.com |
| 331-310 | Big Rock | Landline | Bandwidth.com |
| 331-315 | Lombard | Wireless | New Cingular Wireless |
| 331-318 | Lemont | Landline | Local Access |
| 331-321 | Montgomery | Wireless | T-Mobile |
| 331-330 | Oswego | Landline | New Cingular Wireless |
| 331-332 | Naperville | Wireless | New Cingular Wireless |
| 331-333 | Naperville | Wireless | New Cingular Wireless |
| 331-336 | Montgomery | Landline | Fractel |
| 331-345 | Naperville | Landline | Fractel |
| 331-348 | Elburn | Landline | Fractel |
| 331-356 | Hanover Park | Landline | Fractel |
| 331-385 | Montgomery | Wireless | New Cingular Wireless |
| 331-388 | Sugar Grove | Landline | Fractel |
| 331-399 | Woodridge | Landline | Fractel |
| 331-400 | Oswego | Landline | Fractel |
| 331-401 | Naperville | Landline | Level 3 Communications |
| 331-422 | Saint Charles | Landline | Level 3 Communications |
| 331-425 | Montgomery | Wireless | T-Mobile |
| 331-431 | Montgomery | Wireless | Bandwidth.com |
| 331-442 | Saint Charles | Wireless | Verizon |
| 331-444 | Naperville | Landline | Verizon |
| 331-452 | Montgomery | Wireless | Verizon |
| 331-454 | Montgomery | Wireless | New Cingular Wireless |
| 331-456 | Roselle | Landline | First Communications |
| 331-457 | Naperville | Wireless | Verizon |
| 331-462 | Lombard | Landline | XO Communications |
| 331-465 | West Chicago | Wireless | New Cingular Wireless |
| 331-472 | Naperville | Wireless | T-Mobile |
| 331-481 | Woodridge | Wireless | Verizon |
| 331-500 | Geneva | Landline | Fractel |
| 331-529 | Naperville | Landline | Fractel |
| 331-551 | Lombard | Wireless | New Cingular Wireless |
| 331-575 | Montgomery | Wireless | Sprint Spectrum |
| 331-588 | Saint Charles | Wireless | New Cingular Wireless |
| 331-600 | Wheaton | Landline | Fractel |
| 331-625 | Woodridge | Wireless | Verizon |
| 331-642 | Elmhurst | Wireless | Bandwidth.com |
| 331-643 | Montgomery | Wireless | Sprint Spectrum |
| 331-645 | Elmhurst | Wireless | Sprint Spectrum |
| 331-666 | Montgomery | Landline | Onvoy |
| 331-684 | Montgomery | Landline | Sigecom |
| 331-701 | Naperville | Wireless | Verizon |
| 331-702 | Naperville | Landline | Mcimetro Access Transmission Services |
| 331-703 | West Chicago | Wireless | T-Mobile |
| 331-704 | Sugar Grove | Landline | Bandwidth.com |
| 331-707 | Montgomery | Wireless | T-Mobile |
| 331-716 | Wheaton | Landline | Onvoy |
| 331-717 | Oswego | Wireless | New Cingular Wireless |
| 331-725 | Oswego | Landline | New Cingular Wireless |
| 331-732 | Geneva | Landline | Fractel |
| 331-757 | Lemont | Wireless | T-Mobile |
| 331-771 | Saint Charles | Landline | Onvoy |
| 331-775 | Woodridge | Landline | Comcast Phone Of Illinois |
| 331-777 | Woodridge | Landline | Verizon |
| 331-788 | Geneva | Landline | Fractel |
| 331-800 | West Chicago | Landline | Onvoy |
| 331-801 | Woodridge | Landline | Teleport Communications America |
| 331-803 | Lemont | Landline | Peerless Network Of Illinois |
| 331-806 | Wheaton | Landline | Comcast Phone Of Illinois |
| 331-808 | Plano | Landline | Bandwidth.com |
| 331-814 | Naperville | Wireless | T-Mobile |
| 331-825 | Kane | Digital Network Access Communications | |
| 331-826 | Elmhurst | Wireless | Sprint Spectrum |
| 331-867 | Yorkville | Landline | Fractel |
| 331-871 | West Chicago | Landline | Onvoy |
| 331-888 | Warrenville | Landline | Peerless Network Of Illinois |
| 331-899 | Lombard | Landline | Fractel |
| 331-900 | Elmhurst | Landline | Fractel |
| 331-901 | Saint Charles | Landline | Bandwidth.com |
| 331-903 | Woodridge | Landline | AT&T |
| 331-946 | Glen Ellyn | Landline | Fractel |
| 331-979 | Elmhurst | Landline | Comcast Phone Of Illinois |
| 331-980 | Montgomery | Wireless | T-Mobile |
| 331-998 | Woodridge | Wireless | Verizon |
| 331-999 | Oswego | Landline | Bandwidth.com |