| Name | Johnson County |
| State | Tennessee |
| FIPS Code | 47091 |
| County Seat | Mountain City |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 18,376 |
| Population Growth Rate(2020-2024) | 2.31% |
| Majority Ethnicity | White 92.21% |
| Public School Majority Ethnicity | White 94% |
| Partisan Voting Index | Strongly Republican:+35 |
| Unemployment Rate (May 2026) | 5.0% |
| Sales Tax Rate (2025) | 9% |
| Area Code(s) | 423 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 92.21% |
| African American | 3.88% |
| Hispanic | 3.1% |
| Asian | 0.19% |
| Native American | 0.61% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 93.55% |
| African American | 0.09% |
| Hispanic | 5.13% |
| Asian | 0.19% |
| Native American | 0.14% |
| Hawaiin/Pacific Islander | 0.05% |