County Maps US

Oldham County, Kentucky

A county in Kentucky, ranked 11 of 120 by population.

CountyFIPS 21185

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

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Population
70,986
+3,281 (+4.8%) since 2020
Land area
187.3
square miles. A further 4.6% of the total area is water
Population density
379
people per square mile, computed rather than published
County seat
La Grange
Seat of county government.
Established
1823
202 years ago
Largest city
La Grange city
Population 10,669.

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 Oldham 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 Oldham 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 701 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 Oldham 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
Population70,98611th of 120782nd of 3,144
Land area187.3 sq mi109th of 1203,017th of 3,144
Population density379 per sq mi6th of 120362nd of 3,144
Median household income$122,4971st of 12049th of 3,143

Full data for Oldham County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population70,986Vintage 2025 Population Estimates
Population in 202067,705Vintage 2025 Population Estimates
2020 estimates base?67,614Vintage 2025 Population Estimates
Land area187.3 sq mi2025 Gazetteer Files
Water area9.1 sq mi2025 Gazetteer Files
Total area196.3 sq mi2025 Gazetteer Files
Population density?379 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$122,497American Community Survey 2020-2024 5-Year Estimates
Median home value$393,100American Community Survey 2020-2024 5-Year Estimates
Median age39.9American Community Survey 2020-2024 5-Year Estimates
Households23,025American Community Survey 2020-2024 5-Year Estimates
Housing units23,837American 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
+98
564 births, 466 deaths
Net migration
+290
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 Oldham 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
Shelby CountyKentucky17 mi51,243
Clark CountyIndiana16 mi130,451
Jefferson CountyKentucky13 mi795,222
Henry CountyKentucky11 mi16,447
Trimble CountyKentucky7.8 mi8,701

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.