District of Illinois area codes: 312 | |
---|---|
Country | United States |
State/Province | Illinois |
Major City | Chicago |
Time Zone | Central (UTC-06:00) |
Prefix | County | Primary City | Company |
---|---|---|---|
312-369 | Cook | Chicago, IL | New Cingular Wireless PCS |
312-370 | Cook | Chicago, IL | Usa Mobility Wireless |
312-371 | Cook | Chicago, IL | Sprint Spectrum L.p. |
312-372 | Cook | Chicago, IL | Ameritech Illinois |
312-373 | Cook | Chicago, IL | Broadwing Communications |
312-374 | Cook | Chicago, IL | Ameritech Illinois |
312-375 | Cook | Chicago, IL | T-mobile Usa |
312-376 | Cook | Chicago, IL | Cbeyond Communications |
312-377 | Cook | Chicago, IL | Xo Illinois |
312-378 | Cook | Chicago, IL | Usa Mobility Wireless |
312-379 | Cook | Chicago, IL | Ovation Communications Of Illinois |
312-380 | Cook | Chicago, IL | Ameritech Illinois |
312-381 | Cook | Chicago, IL | Ameritech Illinois |
312-382 | Cook | Chicago, IL | Ameritech Illinois |
312-384 | Cook | Chicago, IL | Ameritech Illinois |
312-385 | Cook | Chicago, IL | Ameritech Illinois |
312-386 | Cook | Chicago, IL | Ameritech Illinois |
312-387 | Cook | Chicago, IL | Usa Mobility Wireless |
312-388 | Cook | Chicago, IL | Sprint Spectrum L.p. |
312-389 | Cook | Chicago, IL | Usa Mobility Wireless |
There are 701 prefixes, In the code area, the major cities are Chicago, IL. The major city is Chicago.