312 Area Code Phone Numbers

Where is Area Code 312?

The 312 area code is assigned to Illinois. Area code 312 is one of 325 three-digit telephone area codes in the America. There are about 276,091 unique phone numbers and 383,929 individuals near the cities of Chicago.

Major City:Chicago
Current Time: 9:1pm

Major Cities in 312 Area Code

  • Chicago
Area Code 312 Map
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PrefixUsagePrimary CityCarrierIntroduced