County Maps US

Ogle County, Illinois

A county in Illinois, ranked 28 of 102 by population.

CountyFIPS 17141

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

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Population
51,399
-366 (-0.7%) since 2020
Land area
758.7
square miles. A further 0.6% of the total area is water
Population density
67.8
people per square mile, computed rather than published
County seat
Oregon
Seat of county government.
Established
1836
189 years ago
Largest city
Rochelle city
Population 9,498 for the whole place, which extends beyond this county.

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 Ogle 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 Ogle 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 495 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 Ogle 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
Population51,39928th of 102995th of 3,144
Land area758.7 sq mi17th of 1021,154th of 3,144
Population density67.8 per sq mi35th of 1021,204th of 3,144
Median household income$82,13216th of 102504th of 3,143

Full data for Ogle County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population51,399Vintage 2025 Population Estimates
Population in 202051,765Vintage 2025 Population Estimates
2020 estimates base?51,850Vintage 2025 Population Estimates
Land area758.7 sq mi2025 Gazetteer Files
Water area4.8 sq mi2025 Gazetteer Files
Total area763.4 sq mi2025 Gazetteer Files
Population density?67.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$82,132American Community Survey 2020-2024 5-Year Estimates
Median home value$189,200American Community Survey 2020-2024 5-Year Estimates
Median age42.2American Community Survey 2020-2024 5-Year Estimates
Households20,821American Community Survey 2020-2024 5-Year Estimates
Housing units22,682American 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
-60
523 births, 583 deaths
Net migration
+185
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 Ogle 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
Lee CountyIllinois40 mi32,914
Winnebago CountyIllinois27 mi283,674
Carroll CountyIllinois19 mi15,419
DeKalb CountyIllinois18 mi101,835
Stephenson CountyIllinois15 mi43,220
Whiteside CountyIllinois4.9 mi54,121
Boone CountyIllinoisa single point53,568

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.