County Maps US

Boone County, Indiana

A county in Indiana, ranked 23 of 92 by population.

CountyFIPS 18011

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

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Population
80,689
+9,576 (+13.5%) since 2020
Land area
422.9
square miles. A further 0.1% of the total area is water
Population density
191
people per square mile, computed rather than published
County seat
Lebanon
Seat of county government.
Established
1830
195 years ago
Largest city
Zionsville town
Population 33,624.

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 Boone 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 Boone 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 615 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 Boone 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
Population80,68923rd of 92727th of 3,144
Land area422.9 sq mi28th of 922,397th of 3,144
Population density191 per sq mi21st of 92578th of 3,144
Median household income$111,2502nd of 9289th of 3,143

Full data for Boone County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population80,689Vintage 2025 Population Estimates
Population in 202071,113Vintage 2025 Population Estimates
2020 estimates base?70,786Vintage 2025 Population Estimates
Land area422.9 sq mi2025 Gazetteer Files
Water area0.34 sq mi2025 Gazetteer Files
Total area423.2 sq mi2025 Gazetteer Files
Population density?191 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$111,250American Community Survey 2020-2024 5-Year Estimates
Median home value$376,200American Community Survey 2020-2024 5-Year Estimates
Median age38.8American Community Survey 2020-2024 5-Year Estimates
Households28,738American Community Survey 2020-2024 5-Year Estimates
Housing units29,737American 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
+195
839 births, 644 deaths
Net migration
+1,867
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 Boone 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
Clinton CountyIndiana24 mi33,322
Hendricks CountyIndiana20 mi193,510
Montgomery CountyIndiana18 mi38,954
Hamilton CountyIndiana18 mi387,036
Marion CountyIndiana4.6 mi992,196

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.