County Maps US

Woodford County, Illinois

A county in Illinois, ranked 34 of 102 by population.

CountyFIPS 17203

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

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Population
38,111
-294 (-0.8%) since 2020
Land area
527.6
square miles. A further 2.8% of the total area is water
Population density
72.2
people per square mile, computed rather than published
County seat
Eureka
Seat of county government.
Established
1841
184 years ago
Largest city
Eureka city
Population 5,129.

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 Woodford 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 Woodford 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 581 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 Woodford 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
Population38,11134th of 1021,235th of 3,144
Land area527.6 sq mi49th of 1021,984th of 3,144
Population density72.2 per sq mi33rd of 1021,156th of 3,144
Median household income$91,48311th of 102277th of 3,143

Full data for Woodford County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population38,111Vintage 2025 Population Estimates
Population in 202038,405Vintage 2025 Population Estimates
2020 estimates base?38,456Vintage 2025 Population Estimates
Land area527.6 sq mi2025 Gazetteer Files
Water area15.4 sq mi2025 Gazetteer Files
Total area543 sq mi2025 Gazetteer Files
Population density?72.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$91,483American Community Survey 2020-2024 5-Year Estimates
Median home value$197,600American Community Survey 2020-2024 5-Year Estimates
Median age40.4American Community Survey 2020-2024 5-Year Estimates
Households14,685American Community Survey 2020-2024 5-Year Estimates
Housing units15,758American 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
-6
391 births, 397 deaths
Net migration
-78
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 Woodford 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 CountyIllinois29 mi171,419
Tazewell CountyIllinois25 mi130,049
Marshall CountyIllinois22 mi11,473
Peoria CountyIllinois14 mi178,553
Livingston CountyIllinois12 mi35,057
LaSalle CountyIllinois6.1 mi107,773

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.