Area Code 231

There are 602 phone number prefixes within area code 231. Additionally, there are more than 700 phone numbers in this area code that have received at least one user report. The location of calls from area code 231 is Michigan, USA. Most numbers in this area code are in US Eastern time, where the time is currently 10:35:42 AM on September 16, 2025.
 
Choose a phone number from the list below to browse user reports for . You can also use the search box above to search for user reports about any phone number, or to file a report about any phone number.