WhereCall is here to provide you with the most information on the area code 231, located in MICHIGAN.

NPA Information
Area Code (NPA) 231
In Jeopardy? No
Is Assigned? Yes
Assignment Date 11 Mar 1999
In Service? Yes
In Service Date 05 Jun 1999
Parent NPA 616
Overlay No
Predominant Timezone(s) UTC-05:00

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