County Maps US

Winnebago County, Wisconsin

A county in Wisconsin, ranked 7 of 72 by population.

CountyFIPS 55139

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

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Population
174,218
+2,385 (+1.4%) since 2020
Land area
434.7
square miles. A further 24.9% of the total area is water
Population density
401
people per square mile, computed rather than published
County seat
Oshkosh
Seat of county government.
Established
1848
177 years ago
Largest city
Oshkosh city
Population 67,460.

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 Winnebago 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 Winnebago County, Wisconsin 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 792 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 Winnebago County ranks

Position among the 72 counties of Wisconsin, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn WisconsinNationally
Population174,2187th of 72405th of 3,144
Land area434.7 sq mi62nd of 722,331st of 3,144
Population density401 per sq mi8th of 72344th of 3,144
Median household income$74,92529th of 72846th of 3,143

Full data for Winnebago County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population174,218Vintage 2025 Population Estimates
Population in 2020171,833Vintage 2025 Population Estimates
2020 estimates base?171,740Vintage 2025 Population Estimates
Land area434.7 sq mi2025 Gazetteer Files
Water area143.9 sq mi2025 Gazetteer Files
Total area578.6 sq mi2025 Gazetteer Files
Population density?401 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$74,925American Community Survey 2020-2024 5-Year Estimates
Median home value$225,800American Community Survey 2020-2024 5-Year Estimates
Median age38.7American Community Survey 2020-2024 5-Year Estimates
Households72,667American Community Survey 2020-2024 5-Year Estimates
Housing units77,318American 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
+18
1,683 births, 1,665 deaths
Net migration
+896
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 Winnebago 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
Fond du Lac CountyWisconsin27 mi104,669
Calumet CountyWisconsin21 mi53,982
Waushara CountyWisconsin18 mi25,223
Outagamie CountyWisconsin17 mi195,894
Waupaca CountyWisconsin7.3 mi51,461
Green Lake CountyWisconsin6.1 mi19,305

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 72 counties of Wisconsin

Open the interactive Wisconsin county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.