Area codes 423 and 729

Area codes 423 and 729 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Tennessee. The numbering plan area comprises two geographically disjoined areas of East Tennessee, separated by numbering plan area 865, as well as portions of Van Buren and Sequatchie counties in Middle Tennessee.

Principal cities in the northern part of the numbering plan area are Morristown, Greeneville, and the Tri-Cities (Kingsport, Johnson City, Bristol). The principal cities in the south are Chattanooga and Cleveland.

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