Area code 231
231 is a North American telephone area code in the U.S. state of Michigan, serving the northwestern portion of the Lower Peninsula. Areas served include Big Rapids, Cadillac, Grant, Kalkaska, Ludington, Manistee, Muskegon, Petoskey, Newaygo, and Traverse City.
It was created in June 1999 as a split from area code 616. 231 is essentially the northern half of the old 616 area code. 616 previously covered the entire western half of the Lower Peninsula, extending west from the north-south line aligned with the Mackinac Bridge. Generally, 231 includes almost all of the territory generally defined as Northern Michigan. Muskegon is usually defined as being part of West Michigan, but now uses 231 rather than 616.
- Planning letter 167, which details 231's creation (PDF)
- Map of Michigan area codes at North American Numbering Plan Administration's website
- List of exchanges from AreaCodeDownload.com, 231 Area Code
|Michigan area codes: 231, 248/947, 269, 313, 517, 586, 616, 734, 810, 906, 989|
|West: Lake Michigan||area code 231||East: 989|
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