Area code 231
Area code 231 includes (but is not limited to) the following communities:
In addition, 231 also includes Bois Blanc Island, which is generally considered part of the Upper Peninsula.
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.
- 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
|West: Lake Michigan||area code 231||East: 989|
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