The U.S. state of Louisiana is divided into five geographically distinct numbering plan areas (NPAs) in the North American Numbering Plan (NANP) which are served by a total of six area codes, with one NPA being an overlay of two codes.
Areacode Yearcreated ParentNPA Overlay Numbering plan area 504 1947 – – New Orleans area 225 1998 504 – Baton Rouge area and parts of south central Louisiana 318 1957 504 318/457 northern Louisiana 457 2025 318 337 1999 318 – southwestern Louisiana 985 2001 504 – sections of southeast Louisiana which are not within the 504 area code
See also List of North American Numbering Plan area codes
References