Johnson County
Also known as Johnson County, Tennessee, Johnson County, TN
county in Tennessee, United States
Key facts
- Country
- United States
- State
- Tennessee
- Named after
- Thomas Johnson, early settler
- Seat
- Mountain City
- Largest town
- Mountain City
- Total
- 303 sq mi (780 km )
- Land
- 298 sq mi (770 km )
- Water
- 4.2 sq mi (11 km ) 1.4%
- Estimate 2025
- 18,718
- Density
- 61/sq mi (24/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional district
Article
Johnson County is the easternmost county in the U.S. state of Tennessee. As of the 2020 census, the population was 17,948. Its county seat is Mountain City.
History