Search results
Area code 406 is the telephone area code in the North American Numbering Plan for the entire U.S. state of Montana. It has been Montana's only area code since the American Telephone and Telegraph Company created a nationwide telephone numbering plan in 1947.
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. As of July 2023, California has 38 active area codes.
Area CodeService AreaNotesStockton, Modesto, Merced, Turlock; the ...Split from 415 on October 26, 1957; split ...Much of the City of Los Angeles and ...October 1947; split numerous times since ...Sacramento and most of the Sacramento ...overlay with 916, started service on ...The western and southwestern parts of Los ...Split from 213 on November 2, 1991;Major cities and communities served by area code 406. Find out where 406 area code zone from, which states, counties and cities it covers. Get the most exact information on time zones here.
Each NPA is identified by one or more numbering plan area codes ( NPA codes, or area codes ), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
CodeTerritory Or UseDate200not in use; available for non-geographic ...easily recognizable code (ERC)New Jersey ( Bergen County and Hudson ...19471947Southwestern Connecticut ( Bridgeport, ...1947This is a list of North American telephone area codes in effect for the North American Numbering Plan (NANP). The area to which an area code is officially assigned is known as a Numbering Plan Area (NPA). An area code is part of a telephone number in the United States, Canada, and the Caribbean.
Apr 6, 2021 · Montana's 406 area code is one of 83 area codes that will require ten-digit dialing by the end of 2021. This means if you want to call someone in the 406 area code, starting Oct. 24, 2021 you'll...
Find 406 area code details including city, time zone, and map. Lookup area code 406 phone number, name, and location.
