331 Area Code
western suburbs of Chicago, Illinois
Area Code Information
| Area Code: | 331 |
| Major City: | western suburbs of Chicago |
| State/Region: | Illinois (IL) |
| Time Zone: | Central |
| Current Local Time: | 12:27 AM |
| In Service Since: | 10/7/07 |
| Overlay: | Yes (331/630/331) |
Other Area Codes in Illinois
Prefixes & Exchanges
Showing 158 prefixes for area code 331
| Prefix | Location | Company | Assigned |
|---|---|---|---|
| 331-200 | Bartlett | T-MOBILE USA, INC. | 7/11/11 |
| 331-201 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 1/6/12 |
| 331-202 | Elmhurst | SPRINT SPECTRUM L.P. | 1/17/12 |
| 331-203 | Aurora | SPRINT SPECTRUM L.P. | 10/12/11 |
| 331-204 | Naperville | ONVOY, LLC - IL | 12/10/15 |
| 331-205 | Aurora | T-MOBILE USA, INC. | 10/21/11 |
| 331-206 | Aurora | SPRINT SPECTRUM L.P. | 10/12/11 |
| 331-207 | Yorkville | LEVEL 3 COMMUNICATIONS, LLC - IL | 11/1/11 |
| 331-208 | Aurora | SPRINT SPECTRUM L.P. | 11/8/11 |
| 331-209 | Elmhurst | LEVEL 3 COMMUNICATIONS, LLC - IL | 1/17/12 |
| 331-210 | St Charles | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 3/6/12 |
| 331-211 | -- | [UNASSIGNED] | -- |
| 331-212 | Aurora | MCI WORLDCOM COMMUNICATIONS, INC. - IL | 4/5/12 |
| 331-213 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/6/11 |
| 331-214 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6/20/12 |
| 331-215 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/28/12 |
| 331-216 | Oswego | NEW CINGULAR WIRELESS PCS, LLC - IL | 10/31/12 |
| 331-217 | -- | [UNASSIGNED] | -- |
| 331-218 | Wheaton | T-MOBILE USA, INC. | 7/9/13 |
| 331-219 | Aurora | TELNYX LLC | 3/16/17 |
| 331-220 | Aurora | SPRINT SPECTRUM L.P. | 7/12/11 |
| 331-221 | Elmhurst | AMERITECH ILLINOIS | 1/21/09 |
| 331-222 | St Charles | NEW CINGULAR WIRELESS PCS, LLC - IL | 10/28/08 |
| 331-223 | St Charles | NEW CINGULAR WIRELESS PCS, LLC - IL | 10/28/08 |
| 331-224 | -- | [UNASSIGNED] | -- |
| 331-225 | Elmhurst | SPRINT SPECTRUM L.P. | 8/22/11 |
| 331-226 | Naperville | T-MOBILE USA, INC. | 3/20/17 |
| 331-227 | Sugargrove | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 5/17/16 |
| 331-228 | St Charles | OVATION COMMUNICATIONS OF ILLINOIS, INC. | 9/21/11 |
| 331-229 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 11/27/12 |
| 331-230 | Aurora | T-MOBILE USA, INC. | 4/5/17 |
| 331-231 | Naperville | NEW CINGULAR WIRELESS PCS, LLC - IL | 8/7/17 |
| 331-232 | W Chicago | NEW CINGULAR WIRELESS PCS, LLC - IL | 8/8/17 |
| 331-233 | Downersgrv | TELNYX LLC | 3/13/17 |
| 331-234 | Sugargrove | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 7/8/13 |
| 331-235 | St Charles | NEW CINGULAR WIRELESS PCS, LLC - IL | 10/17/17 |
| 331-236 | Wheaton | T-MOBILE USA, INC. | 4/5/17 |
| 331-237 | Naperville | MCI WORLDCOM COMMUNICATIONS, INC. - IL | 11/7/17 |
| 331-238 | Downersgrv | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 12/19/17 |
| 331-239 | Yorkville | ONVOY, LLC | 8/27/18 |
| 331-240 | W Chicago | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 4/10/13 |
| 331-241 | Lombard | WEST TELECOM SERVICES, LLC - IL | 10/16/18 |
| 331-242 | Lombard | T-MOBILE USA, INC. | 10/19/18 |
| 331-243 | Lombard | T-MOBILE USA, INC. | 10/19/18 |
| 331-244 | Naperville | ONVOY, LLC | 9/21/17 |
| 331-245 | Bartlett | T-MOBILE USA, INC. | 4/18/13 |
| 331-246 | Lemont | T-MOBILE USA, INC. | 10/19/18 |
| 331-247 | Naperville | VONAGE NETWORK INC. | 11/21/18 |
| 331-248 | Geneva | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL | 7/6/07 |
| 331-249 | Naperville | ONVOY, LLC | 12/5/18 |
| 331-250 | Aurora | T-MOBILE USA, INC. | 4/10/12 |
| 331-251 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 12/5/12 |
| 331-252 | Warrenvl | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 6/2/16 |
| 331-253 | Lemont | T-MOBILE USA, INC. | 10/27/14 |
| 331-254 | Sugargrove | T-MOBILE USA, INC. | 7/16/14 |
| 331-255 | Aurora | ONVOY, LLC | 8/22/17 |
| 331-256 | Aurora | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/13/11 |
| 331-257 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 12/10/18 |
| 331-258 | Aurora | RCLEC, INC. - IL | 2/14/19 |
| 331-259 | Sugargrove | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2/18/19 |
| 331-260 | Downersgrv | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 2/25/19 |
| 331-261 | Lemont | T-MOBILE USA, INC. | 6/20/19 |
| 331-262 | Aurora | SPRINT SPECTRUM L.P. | 7/30/08 |
| 331-263 | Itasca | ONVOY, LLC - IL | 3/11/16 |
| 331-276 | St Charles | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 11/10/14 |
| 331-281 | Naperville | AMERITECH ILLINOIS | 10/25/12 |
| 331-300 | Aurora | T-MOBILE USA, INC. | 3/17/16 |
| 331-301 | Aurora | LOCAL ACCESS LLC - IL | 3/13/13 |
| 331-302 | Aurora | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 2/11/13 |
| 331-303 | Elburn | CIBOLO CREEK VENTURES, LLC DBA ROUTEPOINT COMM IL | 4/22/13 |
| 331-304 | Bartlett | T-MOBILE USA, INC. | 2/20/15 |
| 331-305 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 8/15/13 |
| 331-307 | Lombard | T-MOBILE USA, INC. | 10/13/14 |
| 331-308 | Bartlett | BANDWIDTH.COM CLEC, LLC - IL | 12/23/14 |
| 331-309 | -- | [UNASSIGNED] | -- |
| 331-310 | Big Rock | BANDWIDTH.COM CLEC, LLC - IL | 12/29/14 |
| 331-311 | -- | [UNASSIGNED] | -- |
| 331-312 | -- | [UNASSIGNED] | -- |
| 331-315 | Lombard | NEW CINGULAR WIRELESS PCS, LLC - IL | 8/8/16 |
| 331-318 | Lemont | LOCAL ACCESS LLC - IL | 8/1/13 |
| 331-321 | Aurora | T-MOBILE USA, INC. | 7/20/15 |
| 331-330 | Naperville | NEW CINGULAR WIRELESS PCS, LLC - IL | 8/19/08 |
| 331-331 | -- | [UNASSIGNED] | -- |
| 331-332 | Naperville | NEW CINGULAR WIRELESS PCS, LLC - IL | 11/3/08 |
| 331-333 | Naperville | NEW CINGULAR WIRELESS PCS, LLC - IL | 11/3/08 |
| 331-385 | Aurora | NEW CINGULAR WIRELESS PCS, LLC - IL | 9/28/16 |
| 331-401 | Naperville | LEVEL 3 COMMUNICATIONS, LLC - IL | 12/14/15 |
| 331-411 | -- | [UNASSIGNED] | -- |
| 331-422 | St Charles | LEVEL 3 COMMUNICATIONS, LLC - IL | 11/13/08 |
| 331-425 | Aurora | T-MOBILE USA, INC. | 7/11/07 |
| 331-431 | Aurora | BANDWIDTH.COM CLEC, LLC - IL | 5/26/10 |
| 331-442 | St Charles | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 10/30/08 |
| 331-444 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 8/4/10 |
| 331-452 | Aurora | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/20/07 |
| 331-454 | Aurora | NEW CINGULAR WIRELESS PCS, LLC - IL | 5/7/09 |
| 331-456 | Roselle | FIRST COMMUNICATIONS LLC - IL | 12/5/07 |
| 331-457 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 11/14/08 |
| 331-462 | Lombard | XO ILLINOIS, INC. | 8/23/08 |
| 331-465 | W Chicago | NEW CINGULAR WIRELESS PCS, LLC - IL | 10/17/07 |
| 331-472 | Naperville | T-MOBILE USA, INC. | 10/22/08 |
| 331-481 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 10/29/08 |
| 331-511 | -- | [UNASSIGNED] | -- |
| 331-551 | Lombard | NEW CINGULAR WIRELESS PCS, LLC - IL | 11/5/08 |
| 331-555 | -- | [UNASSIGNED] | -- |
| 331-575 | Aurora | SPRINT SPECTRUM L.P. | 9/18/07 |
| 331-588 | St Charles | NEW CINGULAR WIRELESS PCS, LLC - IL | 2/15/10 |
| 331-591 | -- | [UNASSIGNED] | -- |
| 331-611 | -- | [UNASSIGNED] | -- |
| 331-618 | -- | [UNASSIGNED] | -- |
| 331-625 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 10/16/09 |
| 331-630 | -- | [UNASSIGNED] | -- |
| 331-642 | Elmhurst | BANDWIDTH.COM CLEC, LLC - IL | -- |
| 331-643 | Aurora | SPRINT SPECTRUM L.P. | 9/18/07 |
| 331-645 | Elmhurst | SPRINT SPECTRUM L.P. | 11/5/07 |
| 331-666 | Aurora | ONVOY, LLC | 9/29/17 |
| 331-684 | Aurora | SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE | 7/12/07 |
| 331-700 | -- | [UNASSIGNED] | -- |
| 331-701 | Naperville | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 12/11/14 |
| 331-702 | Naperville | MCI WORLDCOM COMMUNICATIONS, INC. - IL | 10/23/13 |
| 331-703 | W Chicago | T-MOBILE USA, INC. | 10/24/13 |
| 331-704 | Kaneville | BANDWIDTH.COM CLEC, LLC - IL | 4/21/15 |
| 331-707 | Aurora | T-MOBILE USA, INC. | 8/23/16 |
| 331-708 | -- | [UNASSIGNED] | -- |
| 331-711 | -- | [UNASSIGNED] | -- |
| 331-716 | Wheaton | ONVOY, LLC | 1/18/16 |
| 331-717 | Oswego | NEW CINGULAR WIRELESS PCS, LLC - IL | 1/18/16 |
| 331-725 | Oswego | NEW CINGULAR WIRELESS PCS, LLC - IL | -- |
| 331-757 | Lemont | T-MOBILE USA, INC. | 7/13/16 |
| 331-771 | St Charles | ONVOY, LLC - IL | 2/10/16 |
| 331-773 | -- | [UNASSIGNED] | -- |
| 331-775 | Downersgrv | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL | 1/4/16 |
| 331-777 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/22/10 |
| 331-779 | -- | [UNASSIGNED] | -- |
| 331-800 | W Chicago | ONVOY, LLC | 9/29/17 |
| 331-801 | Downersgrv | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 5/15/14 |
| 331-803 | Lemont | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 4/10/13 |
| 331-806 | Wheaton | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL | 6/11/15 |
| 331-808 | Plano | BANDWIDTH.COM CLEC, LLC - IL | 6/5/15 |
| 331-811 | -- | [UNASSIGNED] | -- |
| 331-814 | Naperville | T-MOBILE USA, INC. | 6/25/15 |
| 331-815 | -- | [UNASSIGNED] | -- |
| 331-825 | Geneva | DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL | -- |
| 331-826 | Elmhurst | SPRINT SPECTRUM L.P. | 11/18/08 |
| 331-847 | -- | [UNASSIGNED] | -- |
| 331-871 | W Chicago | ONVOY, LLC - IL | 2/17/16 |
| 331-872 | -- | [UNASSIGNED] | -- |
| 331-888 | Warrenvl | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 9/24/10 |
| 331-901 | St Charles | BANDWIDTH.COM CLEC, LLC - IL | 4/23/15 |
| 331-903 | Downersgrv | AT&T CORP. | 5/15/14 |
| 331-911 | -- | [UNASSIGNED] | -- |
| 331-950 | -- | [UNASSIGNED] | -- |
| 331-958 | -- | AMERITECH ILLINOIS | -- |
| 331-959 | -- | AMERITECH ILLINOIS | -- |
| 331-976 | -- | [UNASSIGNED] | -- |
| 331-979 | Elmhurst | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL | 3/3/15 |
| 331-980 | Aurora | T-MOBILE USA, INC. | 10/13/14 |
| 331-998 | Downersgrv | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 9/16/15 |
| 331-999 | Oswego | BANDWIDTH.COM CLEC, LLC - IL | 9/22/10 |
Illinois Area Codes