Telephone Area 312. Page 5.
Prefix: +1312
This prefix is distributed within the state Illinois
The largest city in the region is Chicago
Time Zone: Central
Winter time: UTC-6
Summer time: UTC-5
Below on the map, there is indicated the largest city in the telephone area +1-312-...-.... Illinois Chicago.
Phone numbers +1-312-YYY-YYYY
| Company | District | Major City | Prefix |
|---|---|---|---|
| Broadwing Communications | Chicago, IL | +1-312646-SSSS | |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312647-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312648-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312649-SSSS |
| Rcn Telecom Services Of Illinois | Cook | Chicago, IL | +1-312650-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312651-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312652-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312653-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312654-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312655-SSSS |
| Nextel Communications | Cook | Chicago, IL | +1-312656-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312657-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312658-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312659-SSSS |
| Teleport Communications Group - Chicago | Cook | Chicago, IL | +1-312660-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312661-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312662-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312663-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312664-SSSS |
| Teleport Communications Group - Chicago | Cook | Chicago, IL | +1-312665-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312666-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312669-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312670-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312671-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312672-SSSS |
| Globalcom-il | Cook | Chicago, IL | +1-312673-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312674-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312675-SSSS |
| Globalcom-il | Chicago, IL | +1-312676-SSSS | |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312677-SSSS |
| Cook | +1-312678-SSSS | ||
| American Messaging (am) | Cook | Chicago, IL | +1-312679-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312680-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312681-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312682-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312683-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312685-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312688-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312689-SSSS |
| Cook | +1-312690-SSSS | ||
| Indiana Paging Ntwk | Cook | Chicago, IL | +1-312691-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312692-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312693-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312694-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312695-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312696-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312697-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312698-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312699-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312701-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312703-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312704-SSSS |
| Teleport Communications Group - Chicago | Cook | Chicago, IL | +1-312705-SSSS |
| Teleport Communications Group - Chicago | Cook | Chicago, IL | +1-312706-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312707-SSSS |
| Cook | +1-312709-SSSS | ||
| Ameritech Illinois | Cook | Chicago, IL | +1-312710-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312712-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312713-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312714-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312715-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312716-SSSS |
| Usa Mobility Wireless | Cook | La Grange Park, IL | +1-312717-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312718-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312719-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312720-SSSS |
| Cook | +1-312724-SSSS | ||
| Bandwidth.com Clec | Chicago, IL | +1-312725-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312726-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312727-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312729-SSSS |
| AT&T Local | Cook | Chicago, IL | +1-312730-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312731-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312732-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312733-SSSS |
| Nextel Communications | Cook | Chicago, IL | +1-312735-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312737-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312738-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312739-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312740-SSSS |
