312 Area Code Area Codes

Area Code: 312
State/Region: Illinois
Major Cities: Chicago
Time Zone: Central
Current Time: 8:49 PM
Date Assigned: 1/1/1947
In Service Since: 1/1/1947
Overlay?: Yes
Overlay Complex: 312/872
Local Call Dialing: 1+10D
Toll Call Dialing: 1+10D

312 Prefixes/Exchanges

The three digits following the area code of a phone number are known as the prefix or exchange. The remaining numbers (last 4 digits) all refer to that prefix/exhange.

View Area Code 312 Prefixes ยป

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