County Maps US

Winneshiek County, Iowa

A county in Iowa, ranked 33 of 99 by population.

CountyFIPS 19191

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

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Population
19,733
-313 (-1.6%) since 2020
Land area
689.8
square miles. A further 0.0% of the total area is water
Population density
28.6
people per square mile, computed rather than published
County seat
Decorah
Seat of county government.
Established
1847
178 years ago
Largest city
Decorah city
Population 7,417.

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 Winneshiek 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 Winneshiek County, Iowa 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 678 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 Winneshiek County ranks

Position among the 99 counties of Iowa, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IowaNationally
Population19,73333rd of 991,840th of 3,144
Land area689.8 sq mi17th of 991,358th of 3,144
Population density28.6 per sq mi44th of 991,966th of 3,144
Median household income$79,06614th of 99619th of 3,143

Full data for Winneshiek County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population19,733Vintage 2025 Population Estimates
Population in 202020,046Vintage 2025 Population Estimates
2020 estimates base?20,065Vintage 2025 Population Estimates
Land area689.8 sq mi2025 Gazetteer Files
Water area0.29 sq mi2025 Gazetteer Files
Total area690.1 sq mi2025 Gazetteer Files
Population density?28.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$79,066American Community Survey 2020-2024 5-Year Estimates
Median home value$259,200American Community Survey 2020-2024 5-Year Estimates
Median age42.6American Community Survey 2020-2024 5-Year Estimates
Households8,139American Community Survey 2020-2024 5-Year Estimates
Housing units9,029American 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
-9
175 births, 184 deaths
Net migration
+70
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 Winneshiek 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
Allamakee CountyIowa29 mi14,238
Fayette CountyIowa24 mi19,047
Howard CountyIowa20 mi9,415
Fillmore CountyMinnesota18 mi21,540
Chickasaw CountyIowa9.0 mi11,663
Houston CountyMinnesota6.0 mi18,400
Clayton CountyIowaa single point16,845

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

All 99 counties of Iowa

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

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