County Maps US

Carroll County, Iowa

A county in Iowa, ranked 32 of 99 by population.

CountyFIPS 19027

Within Iowa
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 Carroll, the county seat, located via the 2025 Census Gazetteer.

Download SVGFull Iowa map downloads

Population
20,303
-422 (-2.0%) since 2020
Land area
569.5
square miles. A further 0.1% of the total area is water
Population density
35.7
people per square mile, computed rather than published
County seat
Carroll
Seat of county government.
Established
1851
174 years ago
Largest city
Carroll city
Population 10,085.

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, Iowa 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 794 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 99 counties of Iowa, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IowaNationally
Population20,30332nd of 991,811th of 3,144
Land area569.5 sq mi51st of 991,784th of 3,144
Population density35.7 per sq mi32nd of 991,781st of 3,144
Median household income$72,93038th of 99977th 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
Population20,303Vintage 2025 Population Estimates
Population in 202020,725Vintage 2025 Population Estimates
2020 estimates base?20,758Vintage 2025 Population Estimates
Land area569.5 sq mi2025 Gazetteer Files
Water area0.83 sq mi2025 Gazetteer Files
Total area570.3 sq mi2025 Gazetteer Files
Population density?35.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$72,930American Community Survey 2020-2024 5-Year Estimates
Median home value$176,000American Community Survey 2020-2024 5-Year Estimates
Median age41.1American Community Survey 2020-2024 5-Year Estimates
Households8,801American Community Survey 2020-2024 5-Year Estimates
Housing units9,560American 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
-17
222 births, 239 deaths
Net migration
-124
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 7 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
Crawford CountyIowa24 mi16,237
Greene CountyIowa24 mi8,658
Audubon CountyIowa18 mi5,509
Sac CountyIowa12 mi9,525
Calhoun CountyIowa12 mi9,562
Guthrie CountyIowa6.0 mi10,782
Shelby CountyIowaa single point11,689

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

All 99 counties of Iowa

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

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