WhereCall is here to provide you with the most information on the area code 331, located in ILLINOIS.

NPA Information
Area Code (NPA) 331
In Jeopardy? No
Is Assigned? Yes
Assignment Date 23 Jul 1999
In Service? Yes
In Service Date 07 Oct 2007
Parent NPA 630
Overlay Yes
Overlay Complex
Predominant Timezone(s) UTC-06:00

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