County Maps US

Effingham County, Illinois

A county in Illinois, ranked 41 of 102 by population.

CountyFIPS 17049

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

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Population
34,519
-176 (-0.5%) since 2020
Land area
478.8
square miles. A further 0.3% of the total area is water
Population density
72.1
people per square mile, computed rather than published
County seat
Effingham
Seat of county government.
Established
1831
194 years ago
Largest city
Effingham city
Population 12,406.

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 Effingham 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 Effingham 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 715 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 Effingham 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
Population34,51941st of 1021,325th of 3,144
Land area478.8 sq mi57th of 1022,161st of 3,144
Population density72.1 per sq mi34th of 1021,159th of 3,144
Median household income$80,40417th of 102568th of 3,143

Full data for Effingham County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population34,519Vintage 2025 Population Estimates
Population in 202034,695Vintage 2025 Population Estimates
2020 estimates base?34,665Vintage 2025 Population Estimates
Land area478.8 sq mi2025 Gazetteer Files
Water area1.2 sq mi2025 Gazetteer Files
Total area480 sq mi2025 Gazetteer Files
Population density?72.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$80,404American Community Survey 2020-2024 5-Year Estimates
Median home value$189,500American Community Survey 2020-2024 5-Year Estimates
Median age40.0American Community Survey 2020-2024 5-Year Estimates
Households13,951American Community Survey 2020-2024 5-Year Estimates
Housing units15,413American 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
+18
391 births, 373 deaths
Net migration
-43
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 5 areas bordering Effingham 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
Fayette CountyIllinois27 mi20,790
Jasper CountyIllinois18 mi9,032
Shelby CountyIllinois18 mi20,576
Clay CountyIllinois18 mi12,793
Cumberland CountyIllinois8.9 mi10,208

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.