331 area code
| State | Illinois |
| Primary City | Aurora, IL |
| Timezone | Central |
Example of cities also covered by area code 331
Aurora, IL
Bartlett, IL
Downers Grove, IL
Elburn, IL
Elmhurst, IL
Geneva, IL
Lemont, IL
Lombard, IL
Naperville, IL
Oswego, IL
Roselle, IL
Saint Charles, IL
Sugar Grove, IL
Warrenville, IL
West Chicago, IL
Wheaton, IL
Yorkville, IL
All searches are confidential and secured!
331 area code prefixes
| 331-200 | BARTLETT | T-MOBILE USA, INC. |
| 331-220 | AURORA | SPRINT SPECTRUM L.P. |
| 331-221 | ELMHURST | AMERITECH ILLINOIS |
| 331-222 | ST CHARLES | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-223 | ST CHARLES | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-248 | GENEVA | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL |
| 331-262 | AURORA | SPRINT SPECTRUM L.P. |
| 331-330 | NAPERVILLE | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-332 | NAPERVILLE | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-333 | NAPERVILLE | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-422 | ST CHARLES | LEVEL 3 COMMUNICATIONS, LLC - IL |
| 331-425 | AURORA | T-MOBILE USA, INC. |
| 331-431 | AURORA | BANDWIDTH.COM CLEC, LLC - IL |
| 331-444 | NAPERVILLE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-452 | AURORA | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-454 | AURORA | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-456 | ROSELLE | FIRST COMMUNICATIONS LLC - IL |
| 331-457 | NAPERVILLE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-462 | LOMBARD | XO ILLINOIS, INC. |
| 331-465 | W CHICAGO | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-472 | NAPERVILLE | T-MOBILE USA, INC. |
| 331-481 | DOWNERSGRV | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-575 | AURORA | SPRINT SPECTRUM L.P. |
| 331-588 | ST CHARLES | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-625 | DOWNERSGRV | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-642 | ELMHURST | BANDWIDTH.COM CLEC, LLC - IL |
| 331-643 | AURORA | SPRINT SPECTRUM L.P. |
| 331-645 | ELMHURST | SPRINT SPECTRUM L.P. |
| 331-684 | AURORA | SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE |
| 331-725 | OSWEGO | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 331-777 | DOWNERSGRV | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 331-826 | ELMHURST | SPRINT SPECTRUM L.P. |
| 331-888 | WARRENVL | PEERLESS NETWORK OF ILLINOIS, LLC - IL |