In 1947, when the American Telephone and Telegraph Company (AT&T) published the first configuration of a nationwide telephone numbering plan, the first version of the North American Numbering Plan (NANP), the U.S. state of Missouri was divided into two numbering plan areas (314 and 816). In 1950, the boundaries were redrawn in the creation of a third numbering plan area, 816. This configuration was stable for forty years into the 1990s, when rapid expansion of telecommunication service required additional area codes.
Area code Created ParentNPA Overlay Numbering plan area 314 1947 – 314/557 St. Louis and many of its immediate suburbs 557 2022 314 573 1996 314 235/573 Eastern and southeastern Missouri (Columbia, Jefferson City, Rolla, Cape Girardeau, Perryville, and Hannibal) 235 2023 573 636 1999 314 – St. Charles, Jefferson, and western St. Louis counties, which forms a ring around the immediate St. Louis area 816 1947 – 816/975 Kansas City and St. Joseph metropolitan areas 975 2002 816 417 1950 816, 314 – Southwestern Missouri (Springfield, Joplin, and Branson) 660 1997 816 – Northern and western Missouri (part of St. Joseph metropolitan area, but including Sedalia, Kirksville, Warrensburg, Maryville)
See also List of North American Numbering Plan area codes
External links