Area Code Box

Area code 423

Where is area code 423?

Chattanooga, Johnson City and Kingsport, Tennessee

Local time: … (Eastern Time)

StateTennessee
CountryUnited States
Main citiesChattanooga, Johnson City and Kingsport
Time zonesEastern Time, Central Time
Overlay area codes729
In service since1995 (created from 615)
Assigned prefixes764
Dialing format(423) XXX-XXXX · +1 423 XXX XXXX from abroad

Look up a 423 number

Enter a 3-digit area code or a full 10-digit number.

Cities and towns in area code 423

Listed by how many phone prefixes (the 3 digits after the area code) are assigned to each place in 423.

Phone companies in area code 423

The carriers that hold the most 423 prefixes. People can move their number to another carrier, so this shows who first issued a number, not who serves it today.

PrefixesCarrier
119South Central Bell Tel (AT&T)
83Centurylink (Lumen)
80New Cingular Wireless PCS (AT&T)
80Verizon Wireless
54Onvoy
38Level 3 Communications
33Paetec Itel
30Bandwidth.com CLEC

All 764 prefixes in area code 423

Pick the 3 digits after the area code to see that prefix’s city and carrier.

Area codes that overlay 423

Questions

Where is area code 423?
Area code 423 is in Tennessee. It serves Chattanooga, Johnson City, Kingsport, Bristol and Cleveland and 71 other cities and towns.
What time zone is area code 423 in?
Area code 423 uses Eastern Time and Central Time. Parts of the area are in different zones, so check the city.
What area codes overlay 423?
729 serves the same area as 423. New numbers in the area can get any of these codes, which is why local calls need all 10 digits.
Is a call from area code 423 a scam?
The area code alone doesn’t tell you. Most calls from 423 are ordinary local calls, but scammers can fake (“spoof”) any number. If you don’t recognize a 423 number, let it go to voicemail.
When did area code 423 start?
423 went into service in 1995. It was created from area code 615.
Can a 423 number be outside Tennessee?
Yes. People keep their numbers when they move and when they switch to mobile or internet phone services, so a 423 caller can be anywhere.

Other area codes in Tennessee

Area codeMain cities
615Nashville, Murfreesboro and Franklin
629Nashville, Murfreesboro and Franklin
731Jackson, Paris and Dyersburg
865Knoxville, Maryville and Oak Ridge
901Memphis, Collierville and Arlington
931Clarksville, Cookeville and Columbia