County Maps US

Grant County, Wisconsin

A county in Wisconsin, ranked 28 of 72 by population.

CountyFIPS 55043

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

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Population
52,446
+457 (+0.9%) since 2020
Land area
1,148
square miles. A further 3.0% of the total area is water
Population density
45.7
people per square mile, computed rather than published
County seat
Lancaster
Seat of county government.
Established
1836
189 years ago
Largest city
Platteville city
Population 11,815.

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 Grant 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 Grant 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 629 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 Grant 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
Population52,44628th of 72981st of 3,144
Land area1,148 sq mi9th of 72538th of 3,144
Population density45.7 per sq mi39th of 721,558th of 3,144
Median household income$66,85853rd of 721,449th of 3,143

Full data for Grant County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population52,446Vintage 2025 Population Estimates
Population in 202051,989Vintage 2025 Population Estimates
2020 estimates base?51,950Vintage 2025 Population Estimates
Land area1,148 sq mi2025 Gazetteer Files
Water area35.8 sq mi2025 Gazetteer Files
Total area1,183 sq mi2025 Gazetteer Files
Population density?45.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$66,858American Community Survey 2020-2024 5-Year Estimates
Median home value$200,700American Community Survey 2020-2024 5-Year Estimates
Median age36.8American Community Survey 2020-2024 5-Year Estimates
Households19,960American Community Survey 2020-2024 5-Year Estimates
Housing units22,332American 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
+101
617 births, 516 deaths
Net migration
-62
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Grant 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
Crawford CountyWisconsin31 mi15,910
Clayton CountyIowa30 mi16,845
Iowa CountyWisconsin27 mi23,951
Lafayette CountyWisconsin21 mi17,478
Dubuque CountyIowa20 mi99,381
Richland CountyWisconsin13 mi17,036
Jo Daviess CountyIllinois11 mi21,594

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.