Area Code 231 Michigan, USA

WhereCall is here to provide you with the most information on the area code 231, located in Michigan, USA. This area code contains 502 prefixes and is not in jeopardy of exceeding the known supply of central office codes during the planning/implementation interval for relief.


NPA Information
Area Code (NPA)231
LocationMichigan, USA
In Jeopardy?No
Is Assigned?Yes
In Service?Yes
In Service Date05 Jun 1999
Parent NPA616
OverlayNo
Predominant Timezone(s)UTC-05:00
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231 area code map