County Maps US

Decatur County, Tennessee

A county in Tennessee, ranked 87 of 95 by population.

CountyFIPS 47039

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

Download SVGFull Tennessee map downloads

Population
11,820
+391 (+3.4%) since 2020
Land area
333.9
square miles. A further 3.2% of the total area is water
Population density
35.4
people per square mile, computed rather than published
County seat
Decaturville
Seat of county government.
Established
1845
180 years ago
Largest city
Parsons city
Population 2,162.

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 Decatur 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 Decatur 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 428 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 Decatur 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
Population11,82087th of 952,293rd of 3,144
Land area333.9 sq mi66th of 952,730th of 3,144
Population density35.4 per sq mi87th of 951,785th of 3,144
Median household income$45,37591st of 952,953rd of 3,143

Full data for Decatur County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population11,820Vintage 2025 Population Estimates
Population in 202011,429Vintage 2025 Population Estimates
2020 estimates base?11,434Vintage 2025 Population Estimates
Land area333.9 sq mi2025 Gazetteer Files
Water area11.0 sq mi2025 Gazetteer Files
Total area344.9 sq mi2025 Gazetteer Files
Population density?35.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$45,375American Community Survey 2020-2024 5-Year Estimates
Median home value$139,600American Community Survey 2020-2024 5-Year Estimates
Median age45.8American Community Survey 2020-2024 5-Year Estimates
Households4,568American Community Survey 2020-2024 5-Year Estimates
Housing units6,591American 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
-98
96 births, 194 deaths
Net migration
+183
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 6 areas bordering Decatur 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
Perry CountyTennessee33 mi9,126
Henderson CountyTennessee31 mi28,518
Hardin CountyTennessee18 mi27,983
Benton CountyTennessee16 mi16,183
Wayne CountyTennessee6.3 mi16,416
Carroll CountyTennessee2.0 mi29,200

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.