County Maps US

Allen County, Kentucky

A county in Kentucky, ranked 52 of 120 by population.

CountyFIPS 21003

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

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Population
22,536
+1,963 (+9.5%) since 2020
Land area
343.7
square miles. A further 2.3% of the total area is water
Population density
65.6
people per square mile, computed rather than published
County seat
Scottsville
Seat of county government.
Established
1815
210 years ago
Largest city
Scottsville city
Population 4,673.

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 Allen 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 Allen 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 669 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 Allen 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
Population22,53652nd of 1201,704th of 3,144
Land area343.7 sq mi49th of 1202,699th of 3,144
Population density65.6 per sq mi55th of 1201,233rd of 3,144
Median household income$61,40340th of 1201,944th of 3,143

Full data for Allen County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population22,536Vintage 2025 Population Estimates
Population in 202020,573Vintage 2025 Population Estimates
2020 estimates base?20,579Vintage 2025 Population Estimates
Land area343.7 sq mi2025 Gazetteer Files
Water area8.1 sq mi2025 Gazetteer Files
Total area351.9 sq mi2025 Gazetteer Files
Population density?65.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,403American Community Survey 2020-2024 5-Year Estimates
Median home value$192,300American Community Survey 2020-2024 5-Year Estimates
Median age40.7American Community Survey 2020-2024 5-Year Estimates
Households8,035American Community Survey 2020-2024 5-Year Estimates
Housing units9,275American 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
+35
288 births, 253 deaths
Net migration
+409
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 Allen 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
Barren CountyKentucky40 mi45,641
Warren CountyKentucky23 mi149,375
Macon CountyTennessee13 mi27,663
Sumner CountyTennessee11 mi215,538
Simpson CountyKentucky11 mi20,788
Monroe CountyKentucky7.6 mi11,191

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.