County Maps US

Calhoun County, Illinois

A county in Illinois, ranked 100 of 102 by population.

CountyFIPS 17013

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

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Population
4,300
-99 (-2.3%) since 2020
Land area
253.8
square miles. A further 10.5% of the total area is water
Population density
16.9
people per square mile, computed rather than published
County seat
Hardin
Seat of county government.
Established
1825
200 years ago
Largest city
Hardin village
Population 779.

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 Calhoun 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 Calhoun County, Illinois 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 592 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 Calhoun County ranks

Position among the 102 counties of Illinois, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IllinoisNationally
Population4,300100th of 1022,866th of 3,144
Land area253.8 sq mi94th of 1022,899th of 3,144
Population density16.9 per sq mi98th of 1022,335th of 3,144
Median household income$93,2039th of 102249th of 3,143

Full data for Calhoun County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population4,300Vintage 2025 Population Estimates
Population in 20204,399Vintage 2025 Population Estimates
2020 estimates base?4,430Vintage 2025 Population Estimates
Land area253.8 sq mi2025 Gazetteer Files
Water area29.8 sq mi2025 Gazetteer Files
Total area283.6 sq mi2025 Gazetteer Files
Population density?16.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$93,203American Community Survey 2020-2024 5-Year Estimates
Median home value$190,900American Community Survey 2020-2024 5-Year Estimates
Median age48.8American Community Survey 2020-2024 5-Year Estimates
Households1,239American Community Survey 2020-2024 5-Year Estimates
Housing units2,300American 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
+2
49 births, 47 deaths
Net migration
-13
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 6 areas bordering Calhoun 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
Lincoln CountyMissouri22 mi66,676
Greene CountyIllinois20 mi11,313
Pike CountyMissouri18 mi17,955
Pike CountyIllinois17 mi14,231
St. Charles CountyMissouri17 mi426,499
Jersey CountyIllinois17 mi21,160

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

All 102 counties of Illinois

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

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