County Maps US

Hancock County, Illinois

A county in Illinois, ranked 61 of 102 by population.

CountyFIPS 17067

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

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Population
16,803
-767 (-4.4%) since 2020
Land area
793.7
square miles. A further 2.5% of the total area is water
Population density
21.2
people per square mile, computed rather than published
County seat
Carthage
Seat of county government.
Established
1825
200 years ago
Largest city
Hamilton city
Population 2,624.

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 Hancock 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 Hancock 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 800 by 780 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 Hancock 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
Population16,80361st of 1021,986th of 3,144
Land area793.7 sq mi16th of 1021,080th of 3,144
Population density21.2 per sq mi88th of 1022,202nd of 3,144
Median household income$65,86558th of 1021,559th of 3,143

Full data for Hancock County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population16,803Vintage 2025 Population Estimates
Population in 202017,570Vintage 2025 Population Estimates
2020 estimates base?17,641Vintage 2025 Population Estimates
Land area793.7 sq mi2025 Gazetteer Files
Water area20.7 sq mi2025 Gazetteer Files
Total area814.4 sq mi2025 Gazetteer Files
Population density?21.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$65,865American Community Survey 2020-2024 5-Year Estimates
Median home value$113,800American Community Survey 2020-2024 5-Year Estimates
Median age46.9American Community Survey 2020-2024 5-Year Estimates
Households7,613American Community Survey 2020-2024 5-Year Estimates
Housing units8,938American 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
-80
157 births, 237 deaths
Net migration
-54
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 Hancock 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
Adams CountyIllinois31 mi64,267
Lee CountyIowa29 mi32,306
McDonough CountyIllinois24 mi25,916
Henderson CountyIllinois15 mi5,984
Clark CountyMissouri10 mi6,475
Schuyler CountyIllinois6.3 mi6,657
Lewis CountyMissouri3.6 mi9,879

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.