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
312-201 Cook Chicago, IL Ameritech Illinois
312-202 Cook Chicago, IL Ameritech Illinois
312-203 Cook Chicago, IL New Cingular Wireless PCS
312-204 Cook Chicago, IL Ameritech Illinois
312-205 Cook Chicago, IL Allegiance Telecom
312-206 Cook Chicago, IL New Cingular Wireless PCS
312-207 Cook Chicago, IL Ameritech Illinois
312-208 Cook Chicago, IL New Cingular Wireless PCS
312-209 Cook Northbrook, IL Cellco Partnership DBA Verizon Wireless
312-212 Cook Chicago, IL Ameritech Illinois
312-213 Cook Chicago, IL New Cingular Wireless PCS
312-214 Cook Chicago, IL Ameritech Illinois
312-215 Cook Wheeling, IL New Cingular Wireless PCS
312-216 Cook Chicago, IL First Communications LLC
312-217 Cook Chicago, IL United States Cellular Corp. - Illinois
312-218 Cook Chicago, IL New Cingular Wireless PCS
312-219 Cook Chicago, IL Bandwidth.com Clec
312-220 Cook Chicago, IL Ameritech Illinois
312-221 Cook Chicago, IL Sprint Spectrum L.p.
312-222 Cook Chicago, IL Ameritech 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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