331 Area Code


Area code 331 is an area code that covers Northeastern Illinois, mostly Chicago's Western suburb. Area code 331 overlays the area code of 630.

Illinois has area codes of 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 872.

Time Zone:Central GMT -6:00 with Daylight Saving in the Summer
Assigned Date:23-Jul-99
In Service Date:07-Oct-07

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Where is 331 area code?

The following map shows the coverage of 331 area code. The coverage area is shown in green.

Area code map of the entire U.S.

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