County Maps US

Hardin County, Iowa

A county in Iowa, ranked 45 of 99 by population.

CountyFIPS 19083

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

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Population
16,455
-376 (-2.2%) since 2020
Land area
569.3
square miles. A further 0.1% of the total area is water
Population density
28.9
people per square mile, computed rather than published
County seat
Eldora
Seat of county government.
Established
1851
174 years ago
Largest city
Iowa Falls city
Population 5,013.

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 Hardin 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 Hardin 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 800 by 764 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 Hardin 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
Population16,45545th of 992,008th of 3,144
Land area569.3 sq mi52nd of 991,786th of 3,144
Population density28.9 per sq mi43rd of 991,957th of 3,144
Median household income$65,06977th of 991,627th of 3,143

Full data for Hardin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population16,455Vintage 2025 Population Estimates
Population in 202016,831Vintage 2025 Population Estimates
2020 estimates base?16,880Vintage 2025 Population Estimates
Land area569.3 sq mi2025 Gazetteer Files
Water area0.69 sq mi2025 Gazetteer Files
Total area570 sq mi2025 Gazetteer Files
Population density?28.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,069American Community Survey 2020-2024 5-Year Estimates
Median home value$122,500American Community Survey 2020-2024 5-Year Estimates
Median age45.4American Community Survey 2020-2024 5-Year Estimates
Households7,038American Community Survey 2020-2024 5-Year Estimates
Housing units8,011American 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
-73
171 births, 244 deaths
Net migration
+68
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 7 areas bordering Hardin 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
Hamilton CountyIowa26 mi14,944
Grundy CountyIowa25 mi12,361
Franklin CountyIowa24 mi9,868
Story CountyIowa12 mi101,291
Marshall CountyIowa12 mi39,890
Butler CountyIowaa single point14,049
Wright CountyIowaa single point12,801

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.