County Maps US

Williamson County, Tennessee

A county in Tennessee, ranked 6 of 95 by population.

CountyFIPS 47187

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

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Population
272,061
+22,447 (+9.0%) since 2020
Land area
582.9
square miles. A further 0.2% of the total area is water
Population density
467
people per square mile, computed rather than published
County seat
Franklin
Seat of county government.
Established
1799
226 years ago
Largest city
Franklin city
Population 90,226.

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 Williamson 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 Williamson 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 597 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 Williamson 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
Population272,0616th of 95273rd of 3,144
Land area582.9 sq mi16th of 951,688th of 3,144
Population density467 per sq mi6th of 95301st of 3,144
Median household income$135,5941st of 9520th of 3,143

Full data for Williamson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population272,061Vintage 2025 Population Estimates
Population in 2020249,614Vintage 2025 Population Estimates
2020 estimates base?247,790Vintage 2025 Population Estimates
Land area582.9 sq mi2025 Gazetteer Files
Water area1.2 sq mi2025 Gazetteer Files
Total area584.1 sq mi2025 Gazetteer Files
Population density?467 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$135,594American Community Survey 2020-2024 5-Year Estimates
Median home value$751,900American Community Survey 2020-2024 5-Year Estimates
Median age40.4American Community Survey 2020-2024 5-Year Estimates
Households92,214American Community Survey 2020-2024 5-Year Estimates
Housing units96,921American 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
+551
2,186 births, 1,635 deaths
Net migration
+3,036
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 Williamson 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
Maury CountyTennessee32 mi118,131
Rutherford CountyTennessee32 mi386,352
Davidson CountyTennessee31 mi745,904
Marshall CountyTennessee10.0 mi38,071
Dickson CountyTennessee8.5 mi58,662
Hickman CountyTennessee7.8 mi26,219
Cheatham CountyTennessee7.2 mi42,778

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.