County Maps US

Lyon County, Kentucky

A county in Kentucky, ranked 101 of 120 by population.

CountyFIPS 21143

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

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Population
9,123
+450 (+5.2%) since 2020
Land area
213.8
square miles. A further 16.7% of the total area is water
Population density
42.7
people per square mile, computed rather than published
County seat
Eddyville
Seat of county government.
Established
1854
171 years ago
Largest city
Eddyville city
Population 2,306.

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 Lyon 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 Lyon 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 749 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 Lyon 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
Population9,123101st of 1202,478th of 3,144
Land area213.8 sq mi95th of 1202,978th of 3,144
Population density42.7 per sq mi79th of 1201,615th of 3,144
Median household income$65,06629th of 1201,628th of 3,143

Full data for Lyon County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population9,123Vintage 2025 Population Estimates
Population in 20208,673Vintage 2025 Population Estimates
2020 estimates base?8,678Vintage 2025 Population Estimates
Land area213.8 sq mi2025 Gazetteer Files
Water area42.7 sq mi2025 Gazetteer Files
Total area256.5 sq mi2025 Gazetteer Files
Population density?42.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,066American Community Survey 2020-2024 5-Year Estimates
Median home value$189,500American Community Survey 2020-2024 5-Year Estimates
Median age47.1American Community Survey 2020-2024 5-Year Estimates
Households3,419American Community Survey 2020-2024 5-Year Estimates
Housing units4,847American 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
-65
58 births, 123 deaths
Net migration
+113
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 Lyon 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
Caldwell CountyKentucky20 mi12,609
Trigg CountyKentucky17 mi14,512
Crittenden CountyKentucky16 mi8,807
Livingston CountyKentucky14 mi8,863
Marshall CountyKentucky9.4 mi31,659

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.