County Maps US

Green County, Wisconsin

A county in Wisconsin, ranked 40 of 72 by population.

CountyFIPS 55045

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

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Population
37,227
+188 (+0.5%) since 2020
Land area
584
square miles. A further 0.1% of the total area is water
Population density
63.7
people per square mile, computed rather than published
County seat
Monroe
Seat of county government.
Established
1836
189 years ago
Largest city
Monroe city
Population 10,581.

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 Green 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 Green 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 780 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 Green 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
Population37,22740th of 721,260th of 3,144
Land area584 sq mi50th of 721,684th of 3,144
Population density63.7 per sq mi30th of 721,261st of 3,144
Median household income$82,85211th of 72488th of 3,143

Full data for Green County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population37,227Vintage 2025 Population Estimates
Population in 202037,039Vintage 2025 Population Estimates
2020 estimates base?37,090Vintage 2025 Population Estimates
Land area584 sq mi2025 Gazetteer Files
Water area0.51 sq mi2025 Gazetteer Files
Total area584.6 sq mi2025 Gazetteer Files
Population density?63.7 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$82,852American Community Survey 2020-2024 5-Year Estimates
Median home value$250,200American Community Survey 2020-2024 5-Year Estimates
Median age43.6American Community Survey 2020-2024 5-Year Estimates
Households15,775American Community Survey 2020-2024 5-Year Estimates
Housing units16,480American 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
-40
369 births, 409 deaths
Net migration
+29
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 Green 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
Dane CountyWisconsin25 mi590,375
Rock CountyWisconsin24 mi166,472
Stephenson CountyIllinois22 mi43,220
Lafayette CountyWisconsin21 mi17,478
Iowa CountyWisconsin3.0 mi23,951
Winnebago CountyIllinois1.8 mi283,674

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.