TENNESSEE · AREA CODE GUIDE
423 and 729 area codes location: Chattanooga, Tennessee
- Local date and time
- Eastern TimeCentral Time
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A printable area code 423 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
423 and 729 area codes at a glance
- Country and calling code
- United States (+1)
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Sources: NANPA area code listing, NANPA places by area code. Checked .
| Area code | Started service | Parent code | New code planned |
|---|---|---|---|
| 423 | 615 | No, as of 22 September 2026 | |
| 729 | 423 | No, as of 22 September 2026 |
History
Time zones
- Eastern Time
- Standard time UTC−05:00
- Daylight saving time UTC−04:00
- Central Time
- Standard time UTC−06:00
- Daylight saving time UTC−05:00
Time zones by place
This area spans Eastern and Central time.
Eastern Time
- Chattanooga
- Johnson City
- Kingsport
- Cleveland
- Morristown
- Bristol
- Greeneville
- Athens
- Elizabethton
- Soddy Daisy
- Collegedale
- Dayton
- Church Hill
- La Follette
- Newport
- Sweetwater
- Erwin
- Madisonville
- Rogersville
- Oneida
- Etowah
- New Tazewell
- Mosheim
- Mountain City
- Jellico
- Spring City
- Surgoinsville
- Bluff City
- Vonore
- Huntsville
- Decatur
- Englewood
- Benton
- Sneedville
- Wartburg
- Charleston
- Niota
- Tellico Plains
- Bulls Gap
- Sunbright
- Baileyton
- Cumberland Gap
- Oakdale
- Apison
- Ball Play
- Blountville
- Butler
- Coker Creek
- Deer Lodge
- Fall Branch
- Fork Ridge
- Hampton
- Limestone
- Ooltewah
- Petros
- Riceville
- Roan Mountain
- Robbins
- Shady Valley
- Sullivan Gardens
Central Time
- Dunlap
- Jasper
- South Pittsburg
- Pikeville
- Whitwell
The time zone of 10 communities is not recorded.
Where 423 and 729 reach
423 and 729 numbers are issued across 75 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
- Chattanooga
- Johnson City
- Kingsport
- Cleveland
- Morristown
- Bristol
- Greeneville
- Athens
- Elizabethton
- Soddy Daisy
- Collegedale
- Dayton
- Church Hill
- La Follette
- Newport
- Sweetwater
- Dunlap
- Erwin
- Madisonville
- Rogersville
- Oneida
- Etowah
- Jasper
- South Pittsburg
- New Tazewell
50 more communities
- Mosheim
- Mountain City
- Jellico
- Spring City
- Surgoinsville
- Pikeville
- Bluff City
- Vonore
- Huntsville
- Decatur
- Englewood
- Whitwell
- Benton
- Sneedville
- Wartburg
- Charleston
- Niota
- Tellico Plains
- Bulls Gap
- Sunbright
- Baileyton
- Cumberland Gap
- Oakdale
- Apison
- Ball Play
- Blountville
- Butler
- Clinchport
- Coker Creek
- College Station
- Copper Basin
- Deer Lodge
- Fall Branch
- Fall Creek Falls
- Fork Ridge
- Georgetown
- Hampton
- Jonesboro
- Limestone
- Midway (sullivan)
- Midway (washington)
- Nine Mile
- Ooltewah
- Petros
- Riceville
- Roan Mountain
- Robbins
- Shady Valley
- Stoney Creek
- Sullivan Gardens
Notable places in 423 and 729
| Place | Where | What it is |
|---|---|---|
| University of Tennessee at Chattanooga | 5.2 km from Chattanooga | University, 12,635 12-month enrollment (2023–24) |
| Tri-Cities Regional Airport | 9.5 km from Blountville | Commercial airport, 229,860 enplanements (2024) |
| Chattanooga Metropolitan Airport | 5.3 km from Chattanooga | Commercial airport, 557,741 enplanements (2024) |
| East Tennessee State University | 4.5 km from Johnson City | University, 15,276 12-month enrollment (2023–24) |
| McMinn County Airport | 7.3 km from Etowah | Airport |
| Southern Adventist University | 0.7 km from Collegedale | University, 4,540 12-month enrollment (2023–24) |
| Hunter Museum of American Art | 5.3 km from Chattanooga | Museum |
| Andrew Johnson National Historic Site | 2.0 km from Greeneville | National Historic Site |
| Finley Stadium | 7.0 km from Chattanooga | Stadium |
| Fort Watauga | 1.6 km from Elizabethton | Fortification |
Area code 423
423 started service on .It came from 615.
No new code is planned for the region as of .
Area code 729
729 started service on .It came from 423.
Its numbers are issued in the same communities as 423.
No new code is planned for the region as of .
Questions about 423 and 729
Where are the 423 and 729 area codes?
423 and 729 are in Tennessee. Their numbers are issued in Chattanooga, Johnson City, Kingsport, and 72 other communities.
What time zone are area codes 423 and 729 in?
423 and 729 span Eastern and Central Time. Daylight saving time is observed.
Is 729 an overlay?
Yes. 729 was added as an overlay on 423 on 5 September 2025.
Business phone numbers in area codes 423 and 729, answered by an AI agent
A local number for Chattanooga, Johnson City, and Kingsport, Tennessee, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.