County Maps US

Knox County, Indiana

A county in Indiana, ranked 44 of 92 by population.

CountyFIPS 18083

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

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Population
35,652
-601 (-1.7%) since 2020
Land area
515.8
square miles. A further 1.5% of the total area is water
Population density
69.1
people per square mile, computed rather than published
County seat
Vincennes
Seat of county government.
Established
1790
235 years ago
Largest city
Vincennes city
Population 16,378.

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 Knox 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 Knox County, Indiana 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 763 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 Knox County ranks

Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IndianaNationally
Population35,65244th of 921,301st of 3,144
Land area515.8 sq mi6th of 922,022nd of 3,144
Population density69.1 per sq mi60th of 921,191st of 3,144
Median household income$61,23776th of 921,962nd of 3,143

Full data for Knox County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population35,652Vintage 2025 Population Estimates
Population in 202036,253Vintage 2025 Population Estimates
2020 estimates base?36,284Vintage 2025 Population Estimates
Land area515.8 sq mi2025 Gazetteer Files
Water area8.1 sq mi2025 Gazetteer Files
Total area523.9 sq mi2025 Gazetteer Files
Population density?69.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,237American Community Survey 2020-2024 5-Year Estimates
Median home value$137,700American Community Survey 2020-2024 5-Year Estimates
Median age39.0American Community Survey 2020-2024 5-Year Estimates
Households15,169American Community Survey 2020-2024 5-Year Estimates
Housing units16,974American 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
-88
400 births, 488 deaths
Net migration
-19
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 8 areas bordering Knox 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
Daviess CountyIndiana70 mi34,209
Gibson CountyIndiana31 mi33,091
Lawrence CountyIllinois30 mi13,790
Pike CountyIndiana20 mi12,003
Wabash CountyIllinois18 mi10,907
Sullivan CountyIndiana16 mi20,831
Greene CountyIndiana7.8 mi31,165
Crawford CountyIllinois7.8 mi18,648

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

All 92 counties of Indiana

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

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