Telephone Area 312. Page 3.
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 |
|---|---|---|---|
| American Messaging (am) | Cook | Chicago, IL | +1-312457-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312458-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312460-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312461-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312462-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312463-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312464-SSSS |
| Us Xchange Of Illinois LLC DBA Choice One Comm Il | Cook | Chicago, IL | +1-312465-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312466-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312467-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312469-SSSS |
| Mcimetro Access Transmission Services LLC | Cook | Chicago, IL | +1-312470-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312472-SSSS |
| Ymax Communications Corp. | Chicago, IL | +1-312473-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312474-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312475-SSSS |
| United States Cellular Corp. - Illinois | Cook | Chicago, IL | +1-312476-SSSS |
| Halo Wireless, Inc | Chicago, IL | +1-312477-SSSS | |
| Cook | +1-312478-SSSS | ||
| AT&T Local | Cook | Chicago, IL | +1-312479-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312480-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312482-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312484-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312485-SSSS |
| Mci Worldcom Communications | Cook | Chicago, IL | +1-312486-SSSS |
| Pg Telecom Of Illinois Inc. | Chicago, IL | +1-312488-SSSS | |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312489-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312490-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312491-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312492-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312493-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312494-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312495-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312496-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312497-SSSS |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312498-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312499-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | La Grange Park, IL | +1-312501-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312502-SSSS |
| Broadwing Communications | Cook | Chicago, IL | +1-312503-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312504-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312505-SSSS |
| Cimco Communications | Cook | Chicago, IL | +1-312506-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312507-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312510-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312512-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312513-SSSS |
| American Messaging (am) | Cook | Chicago, IL | +1-312514-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312515-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312516-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312518-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312519-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312520-SSSS |
| AT&T Local | Cook | Chicago, IL | +1-312521-SSSS |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312523-SSSS |
| New Cingular Wireless PCS | Cook | Wheeling, IL | +1-312524-SSSS |
| Mcimetro Access Transmission Services LLC | Cook | Chicago, IL | +1-312525-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312526-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312527-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312528-SSSS |
| AT&T Local | Cook | Chicago, IL | +1-312529-SSSS |
| Usa Mobility Wireless | Cook | Chicago, IL | +1-312530-SSSS |
| New Cingular Wireless PCS | Du Page | Hinsdale, IL | +1-312531-SSSS |
| T-mobile Usa | Cook | Chicago, IL | +1-312532-SSSS |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312533-SSSS |
| Ameritech Illinois | Chicago, IL | +1-312534-SSSS | |
| Ameritech Illinois | Cook | Chicago, IL | +1-312537-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312540-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312541-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312542-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312543-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312544-SSSS |
| Sprint Spectrum L.p. | Cook | Chicago, IL | +1-312545-SSSS |
| Level 3 Communications | Cook | Chicago, IL | +1-312546-SSSS |
| New Cingular Wireless PCS | Cook | Chicago, IL | +1-312547-SSSS |
| Broadwing Communications | Chicago, IL | +1-312548-SSSS | |
| Cellco Partnership DBA Verizon Wireless | Cook | Chicago, IL | +1-312550-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312551-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312552-SSSS |
| Ameritech Illinois | Cook | Chicago, IL | +1-312553-SSSS |
