Area Code 312

312 is the North American Telephone Area Code For Illinois in United States.
District of Illinois area codes: 312
Country United States
State/Province Illinois
Major City Chicago
Time Zone Central (UTC-06:00)

Phone directory with area code 312

Prefix County Primary City Company
312-974 Cook Chicago, IL Ameritech Illinois
312-977 Cook Chicago, IL Ameritech Illinois
312-978 Cook Chicago, IL T-mobile Usa
312-979 Cook Chicago, IL Ameritech Illinois
312-980 Cook Chicago, IL Teleport Communications America
312-981 Cook Chicago, IL Ovation Communications Of Illinois
312-983 Cook Chicago, IL Ameritech Illinois
312-984 Cook Chicago, IL Ameritech Illinois
312-985 Cook Chicago, IL Ovation Communications Of Illinois
312-986 Cook Chicago, IL Ameritech Illinois
312-987 Cook Chicago, IL Ameritech Illinois
312-988 Cook Chicago, IL Ameritech Illinois
312-990 Dupage Hinsdale, IL New Cingular Wireless PCS
312-991 Cook Wheeling, IL New Cingular Wireless PCS
312-992 Cook Chicago, IL Ameritech Illinois
312-993 Cook Chicago, IL Ameritech Illinois
312-994 Cook Chicago, IL Ovation Communications Of Illinois
312-996 Cook Chicago, IL Ameritech Illinois
312-997 Cook Chicago, IL Ameritech Illinois
312-999 Cook Chicago, IL Xo Illinois

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There are 701 prefixes, In the code area, the major cities are Chicago, IL. The major city is Chicago.

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