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
312-223 Cook Chicago, IL Ameritech Illinois
312-224 Cook Chicago, IL Broadwing Communications
312-225 Cook Chicago, IL Ameritech Illinois
312-226 Cook Chicago, IL Ameritech Illinois
312-227 Cook Chicago, IL Ameritech Illinois
312-228 Cook Chicago, IL Ameritech Illinois
312-229 Cook Chicago, IL Ameritech Illinois
312-230 Cook Chicago, IL Ameritech Illinois
312-231 Dupage Roselle, IL New Cingular Wireless PCS
312-232 Cook Chicago, IL American Messaging (am)
312-233 Cook Chicago, IL Ameritech Illinois
312-234 Cook Chicago, IL Ameritech Illinois
312-235 Cook Chicago, IL Ameritech Illinois
312-236 Cook Chicago, IL Ameritech Illinois
312-237 Cook Chicago, IL Cellco Partnership DBA Verizon Wireless
312-238 Cook Chicago, IL Broadwing Communications
312-239 Cook Chicago, IL AT&T Local
312-240 Cook Chicago, IL Ameritech Illinois
312-241 Cook Chicago, IL New Cingular Wireless PCS
312-242 Cook Chicago, IL Teleport Communications America
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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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