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.
Service area
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.
History
It was created in June 1999 as a split from area code 616, which previously covered the entire western half of the Lower Peninsula, extending west from the north-south line aligned with the Mackinac Bridge. 231 was carved out of the northern portion of the old 616 territory. It is centered around the western half of the territory generally defined as Northern Michigan. However, it also includes Muskegon, which is almost universally counted as part of West Michigan.
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
| North: 906 | ||
| West: Lake Michigan | area code 231 | East: 989 |
| South: 616 |