County Maps US

Moultrie County, Illinois

A county in Illinois, ranked 72 of 102 by population.

CountyFIPS 17139

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

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Population
14,371
-114 (-0.8%) since 2020
Land area
336
square miles. A further 2.5% of the total area is water
Population density
42.8
people per square mile, computed rather than published
County seat
Sullivan
Seat of county government.
Established
1843
182 years ago
Largest city
Sullivan city
Population 4,310.

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 Moultrie 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 Moultrie 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 631 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 Moultrie 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
Population14,37172nd of 1022,132nd of 3,144
Land area336 sq mi86th of 1022,722nd of 3,144
Population density42.8 per sq mi54th of 1021,611th of 3,144
Median household income$71,78436th of 1021,063rd of 3,143

Full data for Moultrie County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population14,371Vintage 2025 Population Estimates
Population in 202014,485Vintage 2025 Population Estimates
2020 estimates base?14,530Vintage 2025 Population Estimates
Land area336 sq mi2025 Gazetteer Files
Water area8.5 sq mi2025 Gazetteer Files
Total area344.5 sq mi2025 Gazetteer Files
Population density?42.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$71,784American Community Survey 2020-2024 5-Year Estimates
Median home value$134,000American Community Survey 2020-2024 5-Year Estimates
Median age40.1American Community Survey 2020-2024 5-Year Estimates
Households5,817American Community Survey 2020-2024 5-Year Estimates
Housing units6,240American 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
0
184 births, 184 deaths
Net migration
-71
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 Moultrie 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
Shelby CountyIllinois32 mi20,576
Piatt CountyIllinois15 mi16,791
Coles CountyIllinois14 mi46,607
Macon CountyIllinois13 mi99,300
Douglas CountyIllinois9.7 mi19,880

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.