Johnson County | |
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![]() Johnson County Courthouse in Mountain City | |
![]() Location within the U.S. state of Tennessee | |
![]() Tennessee's location within the U.S. | |
Coordinates: 36°28′N 81°52′W / 36.46°N 81.86°W | |
Country | ![]() |
State | ![]() |
Founded | 1836 |
Named for | Thomas Johnson, early settler[1] |
Seat | Mountain City |
Largest town | Mountain City |
Area | |
• Total | 303 sq mi (780 km2) |
• Land | 298 sq mi (770 km2) |
• Water | 4.2 sq mi (11 km2) 1.4% |
Population (2020) | |
• Total | 17,948 ![]() |
• Density | 61/sq mi (24/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional district | 1st |
Johnson County is a county located in the U.S. state of Tennessee. As of the 2020 census, the population was 17,948.[2] Its county seat is Mountain City.[3] It is the state's northeasternmost county, sharing borders with Virginia and North Carolina.