231 Area Code — Traverse City, MI
Area code 231 serves Traverse City and 3 other cities in Michigan. Local time follows America/New_York. It has no overlay codes.
- State
- Michigan
- Primary city
- Traverse City
- Timezone
- America/New_York
- In service since
- 1999
- Type
- Geographic
- Overlay codes
- None
Cities Served by 231
The 231 area code covers 4 cities and communities in Michigan.
- Traverse City
- Muskegon
- Cadillac
- Petoskey
About Area Code 231
Area code 231 is a North American Numbering Plan (NANP) area code that has been in service since 1999. It is administered by NANPA on behalf of the FCC and serves the Michigan region anchored on Traverse City.
231 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 231 line.
Mobile numbers in 231 are portable: a person who moved away from Traverse City may still carry a 231 mobile number on their device. If you receive an unexpected call from a 231 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Michigan, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of Michigan.
Other Michigan Area Codes
Continue exploring the Michigan numbering plan.
231 Area Code FAQ
Where is area code 231?
Area code 231 is located in Michigan, primarily serving Traverse City and surrounding cities including Muskegon, Cadillac, Petoskey. The region operates on ET (America/New_York) time.
What state is 231 area code?
231 is a Michigan area code. It was put into service in 1999 and has no overlay codes — it covers its geographic area exclusively.
Is 231 a scam area code?
231 is a legitimate North American area code allocated by NANPA to Michigan. Like any geographic area code, scammers sometimes spoof 231 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 231 use?
Area code 231 operates on ET (America/New_York). Numbers in this area code follow standard Michigan time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 231 phone number?
Yes. Use the reverse lookup widget above to enter a full 231 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.