County Maps US

Macoupin County, Illinois

A county in Illinois, ranked 32 of 102 by population.

CountyFIPS 17117

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

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Population
43,748
-1,181 (-2.6%) since 2020
Land area
863
square miles. A further 0.5% of the total area is water
Population density
50.7
people per square mile, computed rather than published
County seat
Carlinville
Seat of county government.
Established
1829
196 years ago
Largest city
Carlinville city
Population 5,465.

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 Macoupin 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 Macoupin 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 565 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 Macoupin 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
Population43,74832nd of 1021,126th of 3,144
Land area863 sq mi11th of 102957th of 3,144
Population density50.7 per sq mi45th of 1021,456th of 3,144
Median household income$70,80541st of 1021,138th of 3,143

Full data for Macoupin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population43,748Vintage 2025 Population Estimates
Population in 202044,929Vintage 2025 Population Estimates
2020 estimates base?45,044Vintage 2025 Population Estimates
Land area863 sq mi2025 Gazetteer Files
Water area4.7 sq mi2025 Gazetteer Files
Total area867.7 sq mi2025 Gazetteer Files
Population density?50.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$70,805American Community Survey 2020-2024 5-Year Estimates
Median home value$138,200American Community Survey 2020-2024 5-Year Estimates
Median age44.2American Community Survey 2020-2024 5-Year Estimates
Households17,576American Community Survey 2020-2024 5-Year Estimates
Housing units21,139American 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
-212
376 births, 588 deaths
Net migration
+41
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Macoupin 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
Montgomery CountyIllinois36 mi28,076
Madison CountyIllinois24 mi263,110
Jersey CountyIllinois18 mi21,160
Greene CountyIllinois18 mi11,313
Morgan CountyIllinois12 mi32,515
Sangamon CountyIllinois12 mi194,170

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.