🇺🇸 231 area code
Area code 231 covers Muskegon, Traverse City, Petoskey and Cadillac and the surrounding area in Michigan. Enter a 231 number below for a free check before you call back.
- Location: Muskegon, Michigan
- Time zone: Eastern (UTC−5)
- In service since June 5, 1999
Consultar un número
Validez, operador, tipo de línea y región en la primera pasada.
Area code 231 at a glance
- Area code
- 231
- Location
- Michigan, United States
- Main cities
- Muskegon, Traverse City, Petoskey, Cadillac, Big Rapids, Charlevoix
- Time zone
- Eastern (UTC−5)
- Local time now
- —
- In service since
- June 5, 1999
- Created from
- 616
- Local calls
- Dial 7 digits
- Number format
- (231) 555-0123
- From abroad
- +1 231 555 0123
Cities in area code 231
- Muskegon
- Traverse City
- Petoskey
- Cadillac
- Big Rapids
- Charlevoix
- Cheboygan
- Ludington
- Manistee
- Norton Shores
Is a 231 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 231 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 231 number to people in Michigan because a local-looking call is more likely to be answered. If a 231 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 231
231 entered service on June 5, 1999, when it was split from 616.
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Area code 231 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 231?
Area code 231 is in Michigan, United States. It covers Muskegon, Traverse City, Petoskey, Cadillac, Big Rapids and Charlevoix.
What time zone is area code 231?
231 is in the Eastern (UTC−5) time zone, and observes daylight saving time.
When did area code 231 start?
231 entered service on June 5, 1999, created from 616.
How do I find out who called me from 231?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 231?
If you live in or near Michigan, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 231 callers who will not leave a message are best looked up before you call back.
Got a call from 231?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.