865 area code — Knoxville, TN geographic
Area code 865 is a geographic code serving Knoxville, Tennessee in the Eastern time zone. It has been in service since November 1, 1999. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.
NANPA lists 498 active NXX prefixes in 865, assigned to 45 carriers. 368 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 33 rate centers (billing localities).
Its parent code is 423, which it left in 1999.
Official projections put exhaust at 4Q 2046.
The dialing plan is 10D for home-NPA local calls and 10D across codes.
Practical takeaway: the 865 label narrows geography to Tennessee, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.
Largest localities in 865
| Locality (rate center) | Active prefixes | Also served by |
|---|---|---|
| Knoxville | 273 | — |
| Maryville | 40 | — |
| Oak Ridge | 20 | — |
| Sevierville | 14 | — |
| Kingston | 11 | — |
| Lenoir City | 10 | — |
| Concord | 9 | — |
| Mascot | 8 | — |
| Clinton | 8 | — |
| Harriman | 7 | — |
FAQ
Will 865 run out of numbers?
NANPA's current forecast projects exhaust in 4Q 2046 — decades of capacity remain.
Why am I getting spam calls from 865 numbers?
Scammers spoof recognizable area codes so calls look local or familiar. A displayed 865 number does not prove the call originated there — see our guide to spotting spoofed calls.
Where is a 865 number from?
865 is assigned to Knoxville and surrounding areas of Tennessee in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.
Is 865 a toll-free number?
No. 865 is a geographic code; calls are billed like any other domestic call. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.