County Maps US

Carroll County, Indiana

A county in Indiana, ranked 70 of 92 by population.

CountyFIPS 18015

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

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Population
20,655
+316 (+1.6%) since 2020
Land area
372.2
square miles. A further 0.7% of the total area is water
Population density
55.5
people per square mile, computed rather than published
County seat
Delphi
Seat of county government.
Established
1828
197 years ago
Largest city
Delphi city
Population 2,973.

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 Carroll 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 Carroll 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 795 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 Carroll 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
Population20,65570th of 921,794th of 3,144
Land area372.2 sq mi64th of 922,626th of 3,144
Population density55.5 per sq mi70th of 921,374th of 3,144
Median household income$65,64560th of 921,575th of 3,143

Full data for Carroll County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population20,655Vintage 2025 Population Estimates
Population in 202020,339Vintage 2025 Population Estimates
2020 estimates base?20,309Vintage 2025 Population Estimates
Land area372.2 sq mi2025 Gazetteer Files
Water area2.8 sq mi2025 Gazetteer Files
Total area375 sq mi2025 Gazetteer Files
Population density?55.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,645American Community Survey 2020-2024 5-Year Estimates
Median home value$180,900American Community Survey 2020-2024 5-Year Estimates
Median age43.2American Community Survey 2020-2024 5-Year Estimates
Households8,085American Community Survey 2020-2024 5-Year Estimates
Housing units9,559American 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
+3
205 births, 202 deaths
Net migration
-57
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 5 areas bordering Carroll 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
White CountyIndiana25 mi25,164
Cass CountyIndiana23 mi37,836
Clinton CountyIndiana17 mi33,322
Tippecanoe CountyIndiana13 mi190,456
Howard CountyIndiana8.9 mi83,904

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.