County Maps US

De Witt County, Illinois

A county in Illinois, ranked 70 of 102 by population.

CountyFIPS 17039

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

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Population
15,118
-332 (-2.1%) since 2020
Land area
397.6
square miles. A further 1.9% of the total area is water
Population density
38.0
people per square mile, computed rather than published
County seat
Clinton
Seat of county government.
Established
1839
186 years ago
Largest city
Clinton city
Population 6,781.

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 De Witt 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 De Witt 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 467 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 De Witt 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
Population15,11870th of 1022,089th of 3,144
Land area397.6 sq mi73rd of 1022,538th of 3,144
Population density38.0 per sq mi61st of 1021,714th of 3,144
Median household income$71,67837th of 1021,071st of 3,143

Full data for De Witt County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population15,118Vintage 2025 Population Estimates
Population in 202015,450Vintage 2025 Population Estimates
2020 estimates base?15,507Vintage 2025 Population Estimates
Land area397.6 sq mi2025 Gazetteer Files
Water area7.5 sq mi2025 Gazetteer Files
Total area405.1 sq mi2025 Gazetteer Files
Population density?38.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$71,678American Community Survey 2020-2024 5-Year Estimates
Median home value$130,300American Community Survey 2020-2024 5-Year Estimates
Median age43.7American Community Survey 2020-2024 5-Year Estimates
Households6,595American Community Survey 2020-2024 5-Year Estimates
Housing units7,320American 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
-95
134 births, 229 deaths
Net migration
-30
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 4 areas bordering De Witt 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
McLean CountyIllinois30 mi171,419
Macon CountyIllinois21 mi99,300
Piatt CountyIllinois20 mi16,791
Logan CountyIllinois16 mi27,182

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.