County Maps US

Trempealeau County, Wisconsin

A county in Wisconsin, ranked 43 of 72 by population.

CountyFIPS 55121

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

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Population
31,171
+346 (+1.1%) since 2020
Land area
733
square miles. A further 1.2% of the total area is water
Population density
42.5
people per square mile, computed rather than published
County seat
Whitehall
Seat of county government.
Established
1854
171 years ago
Largest city
Arcadia city
Population 3,840.

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 Trempealeau 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 Trempealeau 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 470 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 Trempealeau 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
Population31,17143rd of 721,413th of 3,144
Land area733 sq mi38th of 721,208th of 3,144
Population density42.5 per sq mi40th of 721,621st of 3,144
Median household income$76,31322nd of 72759th of 3,143

Full data for Trempealeau County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population31,171Vintage 2025 Population Estimates
Population in 202030,825Vintage 2025 Population Estimates
2020 estimates base?30,770Vintage 2025 Population Estimates
Land area733 sq mi2025 Gazetteer Files
Water area9.0 sq mi2025 Gazetteer Files
Total area742 sq mi2025 Gazetteer Files
Population density?42.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$76,313American Community Survey 2020-2024 5-Year Estimates
Median home value$216,700American Community Survey 2020-2024 5-Year Estimates
Median age39.9American Community Survey 2020-2024 5-Year Estimates
Households12,533American Community Survey 2020-2024 5-Year Estimates
Housing units13,431American 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
+110
394 births, 284 deaths
Net migration
+133
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 Trempealeau 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
Buffalo CountyWisconsin52 mi13,318
Jackson CountyWisconsin36 mi20,999
La Crosse CountyWisconsin25 mi121,339
Eau Claire CountyWisconsin18 mi109,033
Winona CountyMinnesota7.8 mi50,523

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.