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US area code · Tennessee

Area code 423

Where the 423 area code is, its overlay and how to dial a +1 423 number from anywhere.

CoversBristol, TennesseeTime zoneECTypeOverlay
Quick answer

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.

StateTennessee
Main areaBristol
Time zoneEC
TypeOverlay
10-digit dialingRequired
In service since22-Nov-1994

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.

Overlay 423 shares its region

Several area codes cover the same geographic area, so two neighbours can have different codes. Because of the overlay, you must dial all 10 digits (area code + number) even for local calls.

423615729

How to dial a 423 number

From abroad+1 423 555-0123
Within the US / Canada1 423 555-0123
Locally (same area)423 555-0123

Cities in the 423 area code

A 423 number is usually in one of these places in Tennessee — 3 counties.

Bristol SullivanEast ChattanoogaEast RidgeJohnson City WashingtonKingsport SullivanMorristown HamblenSouth Cleveland

Other Tennessee area codes

615629729731865901931

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.

Missed a call from +1 423?

In the 30 days to September 24, 2026, 1,222 unwanted calls showing a 423 number were reported to the US Federal Trade Commission, 61% of them recorded messages or robocalls. That puts 423 at #21 of 670 area codes reported.

Other572
Medical & prescriptions219
Calls pretending to be government, businesses, or family and friends117
Reducing your debt (credit cards, mortgage, student loans)108
Before you call back
  • If you do not know anyone in Tennessee, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 423 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 423 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 423:

Bellsouth Telecomm Inc Dba South Central Bell Tel 120United Telephone-Southeast-Tn Dba Centurylink 83Cellco Partnership Dba Verizon Wireless 80New Cingular Wireless PCS, LLC 79Onvoy, LLC 54Level 3 Communications, LLC 38

About 23.8% of the 778 prefixes in use belong to mobile carriers: a 423 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 423 — cities & rate centres