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However, state regulators decided that having the Austin area keep 512 would spare the large number of state agencies in and around the state capital from the expense and disruption of changing their numbers. On February 13, 1999, the 512 area code was reduced to its current size when the southern portion (including Corpus Christi) became 361.
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Map of all Tennessee area codes. 423 - Chattanooga, Johnson City, Kingsport, Bristol: Initially split from 615 in 1995. 615 and 629 (overlay) - Greater Nashville, including Murfreesboro, Mount Juliet: 615 initially split from 901 in a 1954 flash-cut. The 629 overlay for the entire area code was made effective in 2015
A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).
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Tennessee Public Utility Commission approved a new 729 area code for the existing 423 region in eastern Tennessee. The change goes into effect Aug. 5. If you have a 423 number, don't worry.
List of Tennessee area codes; 0–9. Area code 423; Area codes 615 and 629; Area code 731; Area code 865; Area code 901; Area code 931
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