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This is a list of telephone area codes in the state of Missouri. The area codes are allocated within the North American Numbering Plan (NANP) . The two original area codes for Missouri in 1947 were 314 and 816.
Area codes 573 and 235 are telephone area codes in the North American Numbering Plan (NANP) for most of the eastern half of the U.S. state of Missouri outside the immediate St. Louis area, including the state capital of Jefferson City, as well as Columbia, Cape Girardeau, Hannibal, Rolla, and Sikeston.
Missouri (Columbia, Jefferson City, Hannibal, Cape Girardeau, Farmington, Lake of the Ozarks, Poplar Bluff, and most of eastern Missouri excluding the St. Louis metropolitan area) March 24, 2024: overlaid on 573; 236: British Columbia (all, and the isolated border town of Hyder, Alaska, US) June 1, 2013: overlaid on 604, 250, and 778 [2] 2019 ...
When the American Telephone and Telegraph Company (AT&T) created a universal North American telephone numbering plan for Operator Toll Dialing in 1947, and assigned the original North American area codes to numbering plan areas (NPAs), Missouri was divided into two NPAs, which received the area codes 314 and 816.
In 2000, the Missouri PSC announced plans to create an overlay plan for the numbering plan area. On February 20, 2001, the overlay was approved by the North American Numbering Plan Administration (NANPA), [ 4 ] by assigning area code 975 for service starting October 20, 2001, which was later postponed to May 5, 2002. [ 5 ]
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]