The 865 area code is located in the state of Tennessee, and according to Intelius data, covers roughly 574,331 phone numbers and 793,950 listings across 507 prefixes.
This is a General Purpose Code, in service since November 1, 1999.
Area code 865 was split from area code 423.
Local calls within area code 865 require 10 digits dialing, while long-distance calls require 1 plus 10 digits dialing.
Have you received a call from a number with a 865 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) | 143,820 |
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| County Population (2025) | 511,453 |
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| County Population (2025) | 63,764 |
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