County Maps US

Union County, Tennessee

A county in Tennessee, ranked 66 of 95 by population.

CountyFIPS 47173

Within Tennessee
Union County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Maynardville, the county seat, located via the 2025 Census Gazetteer.

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Population
21,450
+1,603 (+8.1%) since 2020
Land area
223.6
square miles. A further 9.5% of the total area is water
Population density
95.9
people per square mile, computed rather than published
County seat
Maynardville
Seat of county government.
Established
1850
175 years ago
Largest city
Maynardville city
Population 2,723.

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 Union 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 Union 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 800 by 798 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 Union 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
Population21,45066th of 951,754th of 3,144
Land area223.6 sq mi86th of 952,962nd of 3,144
Population density95.9 per sq mi39th of 95944th of 3,144
Median household income$62,72734th of 951,828th of 3,143

Full data for Union County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population21,450Vintage 2025 Population Estimates
Population in 202019,847Vintage 2025 Population Estimates
2020 estimates base?19,807Vintage 2025 Population Estimates
Land area223.6 sq mi2025 Gazetteer Files
Water area23.6 sq mi2025 Gazetteer Files
Total area247.1 sq mi2025 Gazetteer Files
Population density?95.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$62,727American Community Survey 2020-2024 5-Year Estimates
Median home value$204,000American Community Survey 2020-2024 5-Year Estimates
Median age42.7American Community Survey 2020-2024 5-Year Estimates
Households7,931American Community Survey 2020-2024 5-Year Estimates
Housing units9,831American 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
-62
236 births, 298 deaths
Net migration
+379
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 5 areas bordering Union 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
Claiborne CountyTennessee25 mi33,229
Campbell CountyTennessee19 mi40,290
Grainger CountyTennessee18 mi25,739
Knox CountyTennessee14 mi511,453
Anderson CountyTennessee7.7 mi82,066

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.