List of Missouri area codes
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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 | Location |
|---|---|
| 314/557 | St. Louis and many of its immediate suburbs |
| 417 | The southwestern quarter of Missouri, including Springfield, Joplin and Branson |
| 573/235 | Eastern and Southeastern Missouri excluding the St. Louis area but including Columbia, Jefferson City, Rolla, Cape Girardeau, Perryville and Hannibal |
| 636 | Greater St. Louis area, including St. Charles, Jefferson, and western St. Louis counties; forms a ring surrounding the immediate St. Louis area (314) |
| 660 | Northern and Western Missouri excluding the Kansas City and St. Joseph metropolitan areas, but including Sedalia, Kirksville, Warrensburg and Maryville |
| 816/975 | The Kansas City and St. Joseph metropolitan areas |
See also
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