312 Area Code

 

Area code 312 is an Illinois area code that covers Chicago and part of its surrounding area. Area code 312 overlays the area code of 872.

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:01-Jan-47
In Service Date:01-Jan-47

Counties that Use 312 Area Code

All Cities & Towns that Use 312 Area Code

 

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Where is 312 area code?

The following map shows the coverage of 312 area code. The coverage area is shown in green.

Area code map of the entire U.S.

 
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