Area code 231
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Area code 231 is a telephone area code in the North American Numbering Plan (NANP) for the northwestern portion of the Lower Peninsula in the U.S. state of Michigan.
Area code 231 is a telephone area code in the North American Numbering Plan (NANP) for the northwestern portion of the Lower Peninsula in the U.S. state of Michigan. ==Service area== The numbering plan area includes the following communities: ==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
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