County Maps US

Greene County, Illinois

A county in Illinois, ranked 85 of 102 by population.

CountyFIPS 17061

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

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Population
11,313
-611 (-5.1%) since 2020
Land area
543.1
square miles. A further 0.6% of the total area is water
Population density
20.8
people per square mile, computed rather than published
County seat
Carrollton
Seat of county government.
Established
1821
204 years ago
Largest city
Carrollton city
Population 2,349.

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 Greene 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 Greene 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 734 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 Greene 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
Population11,31385th of 1022,330th of 3,144
Land area543.1 sq mi46th of 1021,920th of 3,144
Population density20.8 per sq mi90th of 1022,217th of 3,144
Median household income$62,19276th of 1021,877th of 3,143

Full data for Greene County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population11,313Vintage 2025 Population Estimates
Population in 202011,924Vintage 2025 Population Estimates
2020 estimates base?11,975Vintage 2025 Population Estimates
Land area543.1 sq mi2025 Gazetteer Files
Water area3.3 sq mi2025 Gazetteer Files
Total area546.4 sq mi2025 Gazetteer Files
Population density?20.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$62,192American Community Survey 2020-2024 5-Year Estimates
Median home value$95,200American Community Survey 2020-2024 5-Year Estimates
Median age43.4American Community Survey 2020-2024 5-Year Estimates
Households4,452American Community Survey 2020-2024 5-Year Estimates
Housing units5,785American 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
-76
115 births, 191 deaths
Net migration
-6
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 Greene 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
Jersey CountyIllinois41 mi21,160
Calhoun CountyIllinois20 mi4,300
Macoupin CountyIllinois18 mi43,748
Scott CountyIllinois15 mi4,866
Pike CountyIllinois9.1 mi14,231
Morgan CountyIllinois7.9 mi32,515

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.