County Maps US

McLean County, Illinois

The largest of Illinois's 102 counties by land area.

CountyFIPS 17113

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

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Population
171,419
+209 (+0.1%) since 2020
Land area
1,183
square miles. A further 0.3% of the total area is water
Population density
145
people per square mile, computed rather than published
County seat
Bloomington
Seat of county government.
Established
1830
195 years ago
Largest city
Bloomington city
Population 78,804.

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 McLean 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 McLean 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 639 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 McLean 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
Population171,41913th of 102412th of 3,144
Land area1,183 sq mi1st of 102517th of 3,144
Population density145 per sq mi21st of 102715th of 3,144
Median household income$79,90519th of 102589th of 3,143

Full data for McLean County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population171,419Vintage 2025 Population Estimates
Population in 2020171,210Vintage 2025 Population Estimates
2020 estimates base?171,226Vintage 2025 Population Estimates
Land area1,183 sq mi2025 Gazetteer Files
Water area3.0 sq mi2025 Gazetteer Files
Total area1,186 sq mi2025 Gazetteer Files
Population density?145 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$79,905American Community Survey 2020-2024 5-Year Estimates
Median home value$208,400American Community Survey 2020-2024 5-Year Estimates
Median age34.3American Community Survey 2020-2024 5-Year Estimates
Households70,220American Community Survey 2020-2024 5-Year Estimates
Housing units75,305American 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
+318
1,634 births, 1,316 deaths
Net migration
-413
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 8 areas bordering McLean 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
Livingston CountyIllinois34 mi35,057
De Witt CountyIllinois30 mi15,118
Woodford CountyIllinois29 mi38,111
Tazewell CountyIllinois19 mi130,049
Ford CountyIllinois15 mi13,216
Logan CountyIllinois9.1 mi27,182
Champaign CountyIllinois8.1 mi209,972
Piatt CountyIllinois6.1 mi16,791

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.