WhereCall is here to provide you with the most information on the area code 312, located in ILLINOIS.

NPA Information
Area Code (NPA) 312
NPA Status Active
In Jeopardy? No
Is Assigned? Yes
Assignment Date 01 Jan 1947
In Service? Yes
In Service Date 01 Jan 1947
Overlay Yes
Overlay Complex
Predominant Timezone(s) UTC-06:00

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