County Maps US

Mason County, Kentucky

A county in Kentucky, ranked 68 of 120 by population.

CountyFIPS 21161

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

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Population
16,936
-199 (-1.2%) since 2020
Land area
240.1
square miles. A further 2.6% of the total area is water
Population density
70.5
people per square mile, computed rather than published
County seat
Maysville
Seat of county government.
Established
1788
237 years ago
Largest city
Maysville city
Population 8,688.

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 Mason 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 Mason 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 743 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 Mason 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
Population16,93668th of 1201,980th of 3,144
Land area240.1 sq mi89th of 1202,930th of 3,144
Population density70.5 per sq mi51st of 1201,176th of 3,144
Median household income$52,17874th of 1202,652nd of 3,143

Full data for Mason County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population16,936Vintage 2025 Population Estimates
Population in 202017,135Vintage 2025 Population Estimates
2020 estimates base?17,126Vintage 2025 Population Estimates
Land area240.1 sq mi2025 Gazetteer Files
Water area6.3 sq mi2025 Gazetteer Files
Total area246.4 sq mi2025 Gazetteer Files
Population density?70.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$52,178American Community Survey 2020-2024 5-Year Estimates
Median home value$161,500American Community Survey 2020-2024 5-Year Estimates
Median age42.5American Community Survey 2020-2024 5-Year Estimates
Households7,131American Community Survey 2020-2024 5-Year Estimates
Housing units8,190American 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
-56
182 births, 238 deaths
Net migration
+80
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 Mason 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
Fleming CountyKentucky17 mi15,787
Brown CountyOhio16 mi44,397
Bracken CountyKentucky13 mi8,511
Robertson CountyKentucky9.2 mi2,325
Lewis CountyKentucky8.1 mi12,901
Adams CountyOhio3.7 mi27,865

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.