County Maps US

DeKalb County, Tennessee

A county in Tennessee, ranked 65 of 95 by population.

CountyFIPS 47041

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

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Population
21,873
+1,687 (+8.4%) since 2020
Land area
304.4
square miles. A further 7.5% of the total area is water
Population density
71.8
people per square mile, computed rather than published
County seat
Smithville
Seat of county government.
Established
1837
188 years ago
Largest city
Smithville city
Population 5,620.

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 DeKalb 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 DeKalb 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 709 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 DeKalb 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
Population21,87365th of 951,727th of 3,144
Land area304.4 sq mi73rd of 952,803rd of 3,144
Population density71.8 per sq mi51st of 951,161st of 3,144
Median household income$53,15368th of 952,587th of 3,143

Full data for DeKalb County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population21,873Vintage 2025 Population Estimates
Population in 202020,186Vintage 2025 Population Estimates
2020 estimates base?20,074Vintage 2025 Population Estimates
Land area304.4 sq mi2025 Gazetteer Files
Water area24.6 sq mi2025 Gazetteer Files
Total area329 sq mi2025 Gazetteer Files
Population density?71.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$53,153American Community Survey 2020-2024 5-Year Estimates
Median home value$235,500American Community Survey 2020-2024 5-Year Estimates
Median age41.9American Community Survey 2020-2024 5-Year Estimates
Households8,652American Community Survey 2020-2024 5-Year Estimates
Housing units10,155American 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
-38
245 births, 283 deaths
Net migration
+227
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 DeKalb 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
Smith CountyTennessee26 mi20,981
White CountyTennessee24 mi29,612
Putnam CountyTennessee18 mi86,612
Warren CountyTennessee15 mi43,717
Wilson CountyTennessee13 mi175,033
Cannon CountyTennessee13 mi15,296

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.