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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.
231 is an area code in Michigan, US, serving Muskegon and other cities and counties. It lies within the Eastern Time zone (ET), with daylight saving time (DST) from March to November.
References. List of Michigan area codes. This is a list of telephone area codes in the U.S. state of Michigan : 231 – Northwestern Lower Michigan: Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan. 248 – Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township; overlays with area code 947.
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, ...1947231 Mirandela: 278 Moura: 285 Odemira: 283 Penafiel: 255 Peso da Régua: 254 Pombal: 236 Ponta Delgada: 296 Ponte de Sôr: 242 Portalegre: 245 Portimão: 282 Porto: 22 Proença-a-Nova: 274 Santarém: 243 Santiago do Cacém: 269 São João da Madeira: 256 Seia: 238 Setúbal: 265 Tavira: 281 Torre de Moncorvo: 279 Torres Novas: 249 Torres Vedras ...
This 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.
Area code 231 covers much of northwestern Michigan and was created from a split of area code 616 in 1999. It includes counties and cities such as Antrim, Benzie, Charlevoix, Cheboygan, Emmet, Grand Traverse, Kalkaska, Kent, Lake, Leelanau, Mackinac, Manistee, Mecosta, Missaukee, Montcalm, Muskegon, Newaygo, Oceana, Osceola, Otsego, Wexford, Big Rapids, Cadillac, Ludington, Manistee, Muskegon, Norton Shores, Petoskey, Shelby, and Traverse City.
