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231 Area Code

Area code 231 serves Muskegon, Norton Shores, Traverse City, Cadillac, Muskegon Heights and nearby communities in Michigan. It has been in service since June 5, 1999, when it was split from 616.

StateMichigan
Time zoneEastern
Local time now…
Prefixes in use572
Projected to run out2068
MuskegonNorton ShoresTraverse CityCadillacMuskegon HeightsBig RapidsLudingtonManisteePetoskeyMuskegonTraverse CityCadillacBig RapidsLudingtonPetoskey
Cities and towns served by area code 231

Who issues 231 numbers

Mobile 25%VoIP and cable 22%Landline 53%

Share of the 572 prefixes (the three digits after 231) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T Mobility72
AT&T (Michigan Bell)72
Onvoy (Sinch)53
Frontier52
Interactive Services Network43
Verizon Wireless42
123.Net34
T-Mobile28

Cities and towns in area code 231

CityPopulationOther area codes
Muskegon37,224
Norton Shores25,088
Traverse City15,832
Cadillac10,438
Muskegon Heights9,770
Big Rapids8,623
Ludington7,634
Manistee6,157
Petoskey5,772

Got a call from 231?

A 231 number was originally issued in Michigan, but that does not prove the caller is there. 22% of 231 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 572 prefixes in area code 231

Format: (231) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 231

Where is area code 231?
Area code 231 is in Michigan. It covers Muskegon, Norton Shores, Traverse City, Cadillac, Muskegon Heights, Big Rapids and 3 more cities and towns.
What time zone is area code 231?
Area code 231 is in the Eastern time zone.
Is 231 a toll-free number?
No. 231 is a geographic area code in Michigan. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 231 run out of numbers?
NANPA's latest forecast projects area code 231 to exhaust in the first quarter of 2068. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Michigan