County Maps US

Saline County, Illinois

A county in Illinois, ranked 52 of 102 by population.

CountyFIPS 17165

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

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Population
22,772
-969 (-4.1%) since 2020
Land area
380
square miles. A further 1.8% of the total area is water
Population density
59.9
people per square mile, computed rather than published
County seat
Harrisburg
Seat of county government.
Established
1847
178 years ago
Largest city
Harrisburg city
Population 7,922.

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 Saline 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 Saline 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 699 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 Saline 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
Population22,77252nd of 1021,694th of 3,144
Land area380 sq mi77th of 1022,603rd of 3,144
Population density59.9 per sq mi39th of 1021,308th of 3,144
Median household income$53,11798th of 1022,589th of 3,143

Full data for Saline County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population22,772Vintage 2025 Population Estimates
Population in 202023,741Vintage 2025 Population Estimates
2020 estimates base?23,821Vintage 2025 Population Estimates
Land area380 sq mi2025 Gazetteer Files
Water area6.9 sq mi2025 Gazetteer Files
Total area386.9 sq mi2025 Gazetteer Files
Population density?59.9 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$53,117American Community Survey 2020-2024 5-Year Estimates
Median home value$94,300American Community Survey 2020-2024 5-Year Estimates
Median age43.8American Community Survey 2020-2024 5-Year Estimates
Households10,024American Community Survey 2020-2024 5-Year Estimates
Housing units11,547American 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
-159
219 births, 378 deaths
Net migration
+100
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 7 areas bordering Saline 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
Gallatin CountyIllinois21 mi4,616
Williamson CountyIllinois18 mi67,225
Hamilton CountyIllinois18 mi7,859
Pope CountyIllinois16 mi3,672
Franklin CountyIllinois3.0 mi36,916
Hardin CountyIllinois2.1 mi3,588
Johnson CountyIllinois79 ft13,363

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.