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The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [1] As of July 2023, California has 38 active area codes.
To find information on a specific area code, use the area code lookup that makes it easy to find an area code by number and gives detailed information including city/state, timezone, and area code maps.
Area code 231 is a telephone area code in the North American Numbering Plan (NANP) for the northwestern portion of the Lower Peninsula in the U.S. state of Michigan, History.
Our area code lookup makes it easy to find area codes in California. Includes area code listings of all California area codes with corresponding cities.
Find 231 area code details including city, time zone, and map. Lookup area code 231 phone number, name, and location.
Get the current Time Zone (along with Current Time) for each Area Code. Includes US and Canada Area Codes.
