County Maps US

St. Croix County, Wisconsin

A county in Wisconsin, ranked 17 of 72 by population.

CountyFIPS 55109

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

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Population
98,276
+4,401 (+4.7%) since 2020
Land area
722.2
square miles. A further 1.8% of the total area is water
Population density
136
people per square mile, computed rather than published
County seat
Hudson
Seat of county government.
Established
1849
176 years ago
Largest city
Hudson city
Population 15,019.

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 St. Croix 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 St. Croix 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 800 by 620 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 St. Croix 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
Population98,27617th of 72636th of 3,144
Land area722.2 sq mi39th of 721,237th of 3,144
Population density136 per sq mi20th of 72743rd of 3,144
Median household income$103,0462nd of 72144th of 3,143

Full data for St. Croix County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population98,276Vintage 2025 Population Estimates
Population in 202093,875Vintage 2025 Population Estimates
2020 estimates base?93,534Vintage 2025 Population Estimates
Land area722.2 sq mi2025 Gazetteer Files
Water area13.0 sq mi2025 Gazetteer Files
Total area735.2 sq mi2025 Gazetteer Files
Population density?136 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$103,046American Community Survey 2020-2024 5-Year Estimates
Median home value$377,700American Community Survey 2020-2024 5-Year Estimates
Median age40.4American Community Survey 2020-2024 5-Year Estimates
Households37,511American Community Survey 2020-2024 5-Year Estimates
Housing units38,953American 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
+214
988 births, 774 deaths
Net migration
+403
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 5 areas bordering St. Croix 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
Pierce CountyWisconsin31 mi43,519
Polk CountyWisconsin29 mi45,803
Washington CountyMinnesota28 mi286,895
Dunn CountyWisconsin25 mi46,223
Barron CountyWisconsina single point46,484

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.