Johnson County, Tennessee
County seat: Mountain City · Population 18,718 (2025) · 298 sq mi
Johnson County is the 70th most populous of Tennessee's 95 counties, with 18,718 people (2025 estimate). Its county seat is Mountain City. It is part of the East Tennessee region, one of the 3 Grand Divisions of Tennessee. The map shows its 1 city or town and the 7 neighboring counties.
Johnson County facts
- County seat
- Mountain City
- Population (2025 estimate)
- 18,718 +4.3% since 2020
- Land area
- 298 sq mi 75th largest of 95
- Water area
- 4 sq mi
- Population density
- 63 per sq mi
- Established
- 1836
- Same name
- One of 12 Johnson Counties in the US
- Named after
- Thomas Johnson early settler, eponym of Johnson County, Tennessee
- Largest city
- Mountain City 2,490
- Median household income
- $53,129
- Cities and towns
- 1 plus 1 CDPs
- ZIP codes
- 5
- Time zone
- Eastern
- FIPS code
- 47091
Cities and towns in Johnson County
Johnson County has 1 incorporated place. Populations count the people living inside Johnson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Mountain City (county seat) | Town | 2,490 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Butler | 120 | Carter County |
ZIP codes in Johnson County
5 ZIP codes reach into Johnson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 37640 also Carter County
- 37680
- 37683
- 37688
- 37691
Population of Johnson County, 2020–2025
Johnson County grew by 774 people (+4.3%) between April 2020 and July 2025: 745 more deaths than births and a net gain of 1,515 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 17,985 |
| 2021 | 18,042 |
| 2022 | 18,005 |
| 2023 | 18,325 |
| 2024 | 18,522 |
| 2025 | 18,718 |
Neighboring counties
- Carter County southwest · 57,361 people
- Watauga County, North Carolina southeast · 54,786 people
- Ashe County, North Carolina east · 27,514 people
- Sullivan County west · 163,759 people
- Washington County, Virginia north · 53,898 people
- Grayson County, Virginia east · 15,230 people
- Avery County, North Carolina south · 18,110 people
Printable Johnson County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (81 KB)
- PNG (2400 px) (90 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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