The 423 area code is located in the state of Tennessee, and according to Intelius data, covers roughly 878,386 phone numbers and 1,224,851 listings across 770 prefixes.
This is a General Purpose Code, in service since September 11, 1995.
Area code 423 is part of an overlay complex shared with:
Area code 423 was split from area code 615.
Local calls within area code 423 require 10 digits dialing, while long-distance calls require 1 plus 10 digits dialing.
Have you received a call from a number with a 423 area code? Figure out who is calling you by performing a reverse phone lookup search. Intelius can provide you with a phone report that includes (when available) original line type and carrier, the number owner’s name, last known address and past addresses, age, possible relatives, and more.
| County Population (2025) | 115,465 |
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| County Population (2025) | 390,833 |
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| County Population (2025) | 57,404 |
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