423 area code
Where the 423 area code is, its overlay and how to dial a +1 423 number from anywhere.
The 423 area code is in Bristol, Tennessee, United States (EC). To call from abroad: +1 423 555-0123. It is an overlay, so all 10 digits are dialled.
The 423 area code is a geographic North American Numbering Plan (NANP) code covering Bristol, Tennessee. It has been in service since 22-Nov-1994 and sits in the EC time zone.
How to dial a 423 number
+1 423 555-01231 423 555-0123423 555-0123Cities in the 423 area code
A 423 number is usually in one of these places in Tennessee — 3 counties.
Other Tennessee area codes
Frequently asked questions
Where is the 423 area code?
The 423 area code is in Bristol, Tennessee, United States (EC).
Is 423 an overlay area code?
Yes. 423 overlays the same region as 615, 729, so callers dial all 10 digits.
Do I have to dial 10 digits for 423?
Yes — dial the area code plus the seven-digit number.
How do I call a 423 number from another country?
Dial your exit code (or +), then 1, then 423, then the number: +1 423 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 423 number does not pinpoint a street or ZIP code.
Number holders in area code 423
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 778 prefixes are in use in 423, shared by 59 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Bellsouth Telecomm Inc Dba South Central Bell Tel | 120 | 15% |
| United Telephone-Southeast-Tn Dba Centurylink | 83 | 11% |
| Cellco Partnership Dba Verizon Wireless | 80 | 10% |
| New Cingular Wireless PCS, LLC | 79 | 10% |
| Onvoy, LLC | 54 | 7% |
| Level 3 Communications, LLC | 38 | 5% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
Complaints about 423 numbers
- Reports to the FTC, last 30 days
- 1,222
- Recorded messages or robocalls
- 61%
- Rank among area codes
- #21 of 670
- Most reported subjects
- Other (572)
- Medical & prescriptions (219)
- Calls pretending to be government, businesses, or family and friends (117)
Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.
Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).
All US area codes United States +1 Map of area code 423 — cities & rate centres