County Maps US

Johnson County, Tennessee

A county in Tennessee, ranked 70 of 95 by population.

CountyFIPS 47091

Within Tennessee
Johnson County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data.

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Population
18,718
+733 (+4.1%) since 2020
Land area
298.4
square miles. A further 1.4% of the total area is water
Population density
62.7
people per square mile, computed rather than published
County seat
Mountain City
Seat of county government.
Established
1836
189 years ago
Largest city
Mountain City town
Population 2,490.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Johnson County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Johnson County, Tennessee from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 758 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Johnson County ranks

Position among the 95 counties of Tennessee, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn TennesseeNationally
Population18,71870th of 951,895th of 3,144
Land area298.4 sq mi75th of 952,810th of 3,144
Population density62.7 per sq mi58th of 951,279th of 3,144
Median household income$53,12969th of 952,588th of 3,143

Full data for Johnson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population18,718Vintage 2025 Population Estimates
Population in 202017,985Vintage 2025 Population Estimates
2020 estimates base?17,944Vintage 2025 Population Estimates
Land area298.4 sq mi2025 Gazetteer Files
Water area4.3 sq mi2025 Gazetteer Files
Total area302.7 sq mi2025 Gazetteer Files
Population density?62.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$53,129American Community Survey 2020-2024 5-Year Estimates
Median home value$178,600American Community Survey 2020-2024 5-Year Estimates
Median age46.7American Community Survey 2020-2024 5-Year Estimates
Households7,298American Community Survey 2020-2024 5-Year Estimates
Housing units8,761American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-119
162 births, 281 deaths
Net migration
+318
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Johnson County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Carter CountyTennessee29 mi57,361
Watauga CountyNorth Carolina21 mi54,786
Ashe CountyNorth Carolina19 mi27,514
Sullivan CountyTennessee14 mi163,759
Washington CountyVirginia10 mi53,898
Grayson CountyVirginia2.4 mi15,230
Avery CountyNorth Carolina1.7 mi18,110

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 95 counties of Tennessee

Open the interactive Tennessee county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.