Zip Area Code

Chattanooga, Tennessee

Chattanooga, Tennessee, in Hamilton County, has ZIP codes 37401, 37402, 37403, 37404, 37405, 37406 and others, and area code 423, with 729 as an overlay.

ZIP codes
37401, 37402, 37403, 37404 …
Area codes
423, 729
Counties
Hamilton County, Marion County
State
Tennessee
Coordinates
35.0414, -85.2835

ZIP codes in Chattanooga

ZIP codePost officeCountyArea codes
37401*ChattanoogaHamilton County423, 729
37402ChattanoogaHamilton County423, 729
37403ChattanoogaHamilton County423, 729
37404ChattanoogaHamilton County423, 729
37405ChattanoogaMarion County423, 729
37406ChattanoogaHamilton County423, 729
37407ChattanoogaHamilton County423, 729
37408ChattanoogaHamilton County423, 729
37409ChattanoogaHamilton County423, 729
37410ChattanoogaHamilton County423, 729
37411ChattanoogaHamilton County423, 729
37412ChattanoogaHamilton County423, 729
37414*ChattanoogaHamilton County423, 729
37415ChattanoogaHamilton County423, 729
37416ChattanoogaHamilton County423, 729
37419ChattanoogaMarion County423, 729
37421ChattanoogaHamilton County423, 729
37422*ChattanoogaHamilton County423, 729
37424*ChattanoogaHamilton County423, 729
37450ChattanoogaHamilton County423, 729

* No mapped delivery area: P.O. boxes or a single organization. Area codes are those of the nearest ZIP code area.

Area codes for Chattanooga

  • Area code 423

    In service since September 11, 1995. Shares its area with 729. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

  • Area code 729

    In service since September 5, 2025. Shares its area with 423. Local calls are dialed with ten digits; dialing 1 plus ten digits also works.

Area codes here are matched from telephone rate centers, so a place near a boundary can have local numbers from either side of it.

Towns near Chattanooga

Local numbers in area code 423

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