Caller ID for
Area code 231
Area code 231 Muskegon, Michigan
Area code 231 is in Michigan, with numbers assigned in Muskegon, Traverse City, Petoskey and 78 more places. It’s 12:10 AM there now.
- State
- Michigan13 area codes in Michigan
- Time zone
- Eastern12:10 AM there now
- Exchanges
- 57281 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 231 is
Numbers in 231 are assigned to 81 places in 20 counties: Muskegon County, Leelanau County, Grand Traverse County, Emmet County, Wexford County, Mecosta County, plus 14 more.
No single place dominates: Muskegon, the largest, has 12% of the exchanges.
- Muskegon68
- Traverse City53
- Petoskey22
- Cadillac21
- Big Rapids19
- Ludington14
- Cheboygan13
- Manistee12
- Kalkaska10
- Fremont9
- Newaygo9
- Boyne City8
- Frankfort7
- Harbor Springs7
- Charlevoix7
- Hart7
- Reed City7
- Northport7
- Beulah7
- Fife Lake6
- Lake Ann6
- Galien6
- Morley6
- McBain6
Phone companies in 231
572 blocks of numbers in 231 are held by 38 phone companies. The most belong to AT&T Mobility (72), AT&T (72) and Frontier (52).
A large share, about 41%, belongs to competitive and internet phone carriers; wireless networks hold 26% and local phone and cable companies 33%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
231 went into service in 1999, added to the area of 616.
68 new exchanges were assigned since 2021, the latest in March 2026.
Calling 231
It’s 12:10 AM Eastern time in 231 right now.
From elsewhere in the U.S., dial 1, 231 and the 7-digit number.
Nearby area codes
Michigan has 13 area codes: 231, 248, 269, 313, 517, 586, 616, 679, 734, 810, 906, 947 and 989.
- 989 · Saginaw, MI · about 86 mi
- 616 · Grand Rapids, MI · about 90 mi
- 274 · Green Bay, WI · about 128 mi
- 920 · Green Bay, WI · about 132 mi
- 517 · Lansing, MI · about 141 mi
- 269 · Kalamazoo, MI · about 142 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 231 area code
Map of the 231 area code around Muskegon, Traverse City and Petoskey, Michigan.
Cities on the map
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Questions about 231
Where is area code 231?
In Michigan, covering Muskegon, Traverse City and Petoskey and other places across 20 counties.
What time zone is 231 in?
Eastern time. It was 12:10 AM there when this page loaded.
Is 231 an overlay?
No. 231 is the only area code for its area right now.
Which phone companies have 231 numbers?
38 companies hold blocks; the most belong to AT&T Mobility, AT&T and Frontier. About 26% of blocks are wireless.
Is 231 running out of numbers?
Not on record. 68 new exchanges have been assigned since 2021.