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
312-369 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
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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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