# Area code 231

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Area code in Michigan, United States

Map of area code 231 in Michigan.

**Area code 231** is a telephone [area code](/source/NPA_code) in the [North American Numbering Plan](/source/North_American_Numbering_Plan) (NANP) for the northwestern portion of the [Lower Peninsula](/source/Lower_Peninsula_of_Michigan) in the [U.S. state](/source/U.S._state) of [Michigan](/source/Michigan).

## History

Area code 231 was created in June 1999 by an [area code split](/source/Area_code_split) of [area code 616](/source/Area_code_616), which had served the entire western half of the Lower Peninsula, extending west from the north-south line aligned with the [Mackinac Bridge](/source/Mackinac_Bridge). 231 was carved out of the northern part. It is centered around the western half of the territory generally defined as [Northern Michigan](/source/Northern_Michigan). It also includes [Muskegon](/source/Muskegon), which is almost universally counted as part of [West Michigan](/source/West_Michigan).

## Service area

The numbering plan area includes the following communities:

- [Big Rapids](/source/Big_Rapids%2C_Michigan)

- [Boyne City](/source/Boyne_City%2C_Michigan)

- [Cadillac](/source/Cadillac%2C_Michigan)

- [Charlevoix](/source/Charlevoix%2C_Michigan)

- [Cheboygan](/source/Cheboygan%2C_Michigan)

- [East Jordan](/source/East_Jordan%2C_Michigan)

- [Elk Rapids](/source/Elk_Rapids%2C_Michigan)

- [Harbor Springs](/source/Harbor_Springs%2C_Michigan)

- [Hart](/source/Hart%2C_Michigan)

- [Kalkaska](/source/Kalkaska%2C_Michigan)

- [Kingsley](/source/Kingsley%2C_Michigan)

- [Lake City](/source/Lake_City%2C_Michigan)

- [Ludington](/source/Ludington%2C_Michigan)

- [Mackinaw City](/source/Mackinaw_City%2C_Michigan)

- [Manistee](/source/Manistee%2C_Michigan)

- [Muskegon](/source/Muskegon%2C_Michigan)

- [Newaygo](/source/Newaygo%2C_Michigan)

- [Norton Shores](/source/Norton_Shores%2C_Michigan)

- [Petoskey](/source/Petoskey%2C_Michigan)

- [Traverse City](/source/Traverse_City%2C_Michigan)

## External links

- [Planning letter 167, which details 231's creation](http://www.nationalnanpa.com/pdf/pl-nanp-167.pdf) (PDF)

- ["Michigan \[map\] | NANPA"](https://www.nanpa.com/resources/area-code-map/michigan). *NANPA*. Retrieved June 25, 2025.

- [Map of Michigan area codes](http://www.nanpa.com/area_code_maps/display.html?mi) [Archived](https://web.archive.org/web/20080630055917/http://www.nanpa.com/area_code_maps/display.html?mi) 2008-06-30 at the [Wayback Machine](/source/Wayback_Machine) at [North American Numbering Plan Administration](/source/North_American_Numbering_Plan_Administration)'s website

- [List of exchanges from AreaCodeDownload.com, 231 Area Code](https://web.archive.org/web/20081017115948/http://www.areacodedownload.com/231/index.html)

Michigan area codes: 231, 248/947, 269, 313/679, 517, 586, 616, 734, 810, 906, 989 North: 906 West: Lake Michigan 231 East: 989 South: 616

[44°30′N 85°30′W / 44.5°N 85.5°W / 44.5; -85.5](https://geohack.toolforge.org/geohack.php?pagename=Area_code_231&params=44.5_N_85.5_W_region:US-MI_scale:1000000)

This Michigan state location article is a stub. You can help Wikipedia by adding missing information.

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This article related to a telephone area code is a stub. You can help Wikipedia by adding missing information.

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