Knox County
Sign in to savecounty in Tennessee, United States
Key facts
- Country
- United States
- State
- Tennessee
- Founded
- June 15, 1792
- Named after
- Henry Knox
- Seat
- Knoxville
- Largest city
- Knoxville
- Mayor
- Glenn Jacobs ( R )
- Total
- 526 sq mi (1,360 km )
- Land
- 508 sq mi (1,320 km )
- Water
- 18 sq mi (47 km ) 3.5%
- Estimate 2025
- 511,453
- Density
- 943/sq mi (364/km )
- Congressional district
- 2nd
- Website
- knoxcounty .org
via Wikipedia infobox
Article
Knox County is a county located in the U.S. state of Tennessee. The population was 511,453 as of a 2025 estimate, making it the third-most populous county in Tennessee. Its county seat is Knoxville, which is the third-most populous city in Tennessee. Knox County is included in the Knoxville metropolitan area. The county is located at the geographical center of the Great Valley of East Tennessee. Near the heart of the county is the origin of the Tennessee River, at the confluence of the Holston and French Broad rivers.
History