331 Area Code Area Codes

Area Code: 331
State/Region: N Illinois
Major Cities: western suburbs of Chicago
Time Zone: Central
Current Time: 11:45 AM
Date Assigned: 7/23/1999
In Service Since: 10/7/2007
Overlay?: Yes
Overlay Complex: 630/331
Local Call Dialing: 1+10D
Toll Call Dialing: 1+10D

331 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 331 Prefixes ยป

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