423 area code: location, overlays and numbers
Chattanooga, Tennessee uses area code 423, a US telephone area code that has served the area since 1995 and shares an overlay with 729.
- Location
- Chattanooga, Tennessee
- In service from
- 1995
- The time zone
- Eastern and Central are the time zones
- Overlay
- 729
- Local calling
- 10-digit dialing
- The rate centres
- 75
- Projected exhaustion
- 2081
- Code for the country
- +1 (United States)
Source: NANPA public reports, covering the area code report and the rate-centre report, in a file dated 11/01/2026; the exhaust year comes from NANPA projections 2026-1 (April 2026). This site is not an official NANPA site.
Get your own 423 number
There are two routes to a 423 number. With its plan, a provider hands out a new number, chosen during sign-up from the pool it holds in the code. Sellers offer numbers from their existing stock, often with a pattern, at a one-time price. You then transfer your chosen number to a provider.
Providers sorted by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers listing local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. The order is by first-year cost, and a referral fee never changes it. How we earn
Places in the 423 area code
For 423, NANPA lists 75 rate centres. Each one is a local calling area where numbers get assigned:
Apison, Athens and Baileyton. Ball Play, Benton and Blountville. Bluff City, Bristol and Bulls Gap. Butler, Charleston and Chattanooga. Church Hill, Cleveland and Clinchport. Coker Creek, Collegedale and College Station. Copper Basin, Cumberland Gap and Dayton. Decatur, Deer Lodge and Dunlap. Elizabethton, Englewood and Erwin. Etowah, Fall Branch and Fall Creek Falls. Fork Ridge, Georgetown and Greeneville. Hampton, Huntsville and Jasper. Jellico, Johnson City and Jonesboro. Kingsport, La Follette and Limestone. Madisonville, Midway (washington) and Midway (sullivan). Morristown, Mosheim and Mountain City. Newport, New Tazewell and Nine Mile. Niota, Oakdale and Oneida. Ooltewah, Petros and Pikeville. Riceville, Roan Mountain and Robbins, plus 15 more.
Area codes related to this one
The same area and the same numbers pool: 729. Any of these codes can supply a new number in this area, so ask for the code you prefer.
423 area code questions
What area does 423 cover?
In Chattanooga, Tennessee and the surrounding Chattanooga, TN-GA area, 423 rings.
What country code does a 423 number use?
+1. The North American Numbering Plan includes 423. When calling from abroad, use +1 423 followed by the 7-digit number.
What time is it in the 423 area code?
The time in 423 is Eastern and Central.
Who calls with a 423 number?
Homes, mobiles and local businesses all use numbers in this code, and so do callers who fake a local number. Your screen shows where a 423 number was assigned, which is not the same as knowing who is calling.