County Maps US

Simpson County, Kentucky

A county in Kentucky, ranked 56 of 120 by population.

CountyFIPS 21213

Within Kentucky
Simpson 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
20,788
+1,160 (+5.9%) since 2020
Land area
234.2
square miles. A further 1.0% of the total area is water
Population density
88.8
people per square mile, computed rather than published
County seat
Franklin
Seat of county government.
Established
1819
206 years ago
Largest city
Franklin city
Population 10,759.

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 Simpson 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 Simpson County, Kentucky 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 699 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 Simpson County ranks

Position among the 120 counties of Kentucky, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn KentuckyNationally
Population20,78856th of 1201,788th of 3,144
Land area234.2 sq mi91st of 1202,940th of 3,144
Population density88.8 per sq mi38th of 1201,004th of 3,144
Median household income$59,85851st of 1202,095th of 3,143

Full data for Simpson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population20,788Vintage 2025 Population Estimates
Population in 202019,628Vintage 2025 Population Estimates
2020 estimates base?19,595Vintage 2025 Population Estimates
Land area234.2 sq mi2025 Gazetteer Files
Water area2.3 sq mi2025 Gazetteer Files
Total area236.5 sq mi2025 Gazetteer Files
Population density?88.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$59,858American Community Survey 2020-2024 5-Year Estimates
Median home value$229,400American Community Survey 2020-2024 5-Year Estimates
Median age38.8American Community Survey 2020-2024 5-Year Estimates
Households8,025American Community Survey 2020-2024 5-Year Estimates
Housing units8,627American 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
-10
247 births, 257 deaths
Net migration
+383
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 Simpson 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
Logan CountyKentucky20 mi28,669
Warren CountyKentucky16 mi149,375
Robertson CountyTennessee12 mi80,175
Allen CountyKentucky11 mi22,536
Sumner CountyTennessee9.4 mi215,538

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

All 120 counties of Kentucky

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

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