Area code 231 — who called you?
Numbers starting with 231 are assigned to Northwestern Michigan (Muskegon, Traverse City, Ludington, Petoskey). Paste the full number below to see the caller's name, carrier and community spam reports — free and anonymous.
Area code 231 at a glance
- Area code
- 231
- Region
- Michigan
- Country
- United States
- Dial format
- +1 231 XXX XXXX
Assignment data from the North American Numbering Plan Administration (NANPA).
Got a call from 231? Here's what it means.
The three digits after the +1 country code identify the numbering plan area a number was issued in. For 231, that area is Northwestern Michigan (Muskegon, Traverse City, Ludington, Petoskey). If you don't know anyone there, the call is more likely to be a business, a call centre or an automated dialer than a personal contact.
An area code alone can't tell you who is calling. Numbers are portable, and VoIP providers can issue a 231 number to a caller located anywhere in the world — a technique known as neighbour spoofing, where a familiar area code is used to make a call look local.
To identify the caller, run the full 10-digit number through a lookup. WhoCallsMe checks the number against carrier records, business directories and community spam reports, and shows the line type, carrier and reported risk.