Area code 423 — Tennessee
Area code 423 is in Tennessee. Time zone, overlays, counties and ZIP codes.
| Location | Tennessee (two discontiguous portions of East Tennessee in the northeast and in the southeast) |
|---|---|
| State | Tennessee |
| Status | In service · since 1995 |
| Overlay codes | 729 Overlays share the same area. Local calls usually need 10-digit dialing. |
| Local dialing | 10 digits |
History
- Split of 615
- 1999: split to create 865
- 2025: overlaid with 729
Format a 423 number
US numbers are written as (423) 555-0123 or 423-555-0123. From outside the US, dial +1 423 555 0123.
Is a call from 423 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.