231 Area Code is part of 27 counties in the state of Michigan. There are around 145 cities in the 231 area code. The 231 area code is located in the EST timezone. Michigan has an avarage population of 10,053,439 spread between the coordinates of +43.326618 Latitude and -84.536095 Longitude.
Below you will find more info about 231 Area Code and also zip codes, counties, cities and the post offices that belong to this Area Code.