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, Charlevoix, Cheboygan, Kalkaska, Ludington, Manistee, Mackinaw City, Muskegon, Petoskey, Newaygo, and Traverse City. The area code also includes Bois Blanc Township, which is considered part of the Upper Peninsula.

Map of area code 231 in Michigan.

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 the western half of the territory generally defined as Northern Michigan. Muskegon is almost universally reckoned as being part of West Michigan, but now uses 231 rather than 616.

External links

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
	North: 906
West: Lake Michigan	area code 231	East: 989
	South: 616

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