County Maps US

Green Lake County, Wisconsin

A county in Wisconsin, ranked 55 of 72 by population.

CountyFIPS 55047

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

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Population
19,305
+289 (+1.5%) since 2020
Land area
349.5
square miles. A further 8.0% of the total area is water
Population density
55.2
people per square mile, computed rather than published
County seat
Green Lake
Seat of county government.
Established
1858
167 years ago
Largest city
Berlin city
Population 5,500 for the whole place, which extends beyond this county.

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 Lake 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 Lake 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 614 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 Lake 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
Population19,30555th of 721,867th of 3,144
Land area349.5 sq mi65th of 722,682nd of 3,144
Population density55.2 per sq mi33rd of 721,377th of 3,144
Median household income$68,19646th of 721,321st of 3,143

Full data for Green Lake County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population19,305Vintage 2025 Population Estimates
Population in 202019,016Vintage 2025 Population Estimates
2020 estimates base?19,013Vintage 2025 Population Estimates
Land area349.5 sq mi2025 Gazetteer Files
Water area30.6 sq mi2025 Gazetteer Files
Total area380.1 sq mi2025 Gazetteer Files
Population density?55.2 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$68,196American Community Survey 2020-2024 5-Year Estimates
Median home value$215,400American Community Survey 2020-2024 5-Year Estimates
Median age45.6American Community Survey 2020-2024 5-Year Estimates
Households8,285American Community Survey 2020-2024 5-Year Estimates
Housing units10,772American 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
-69
191 births, 260 deaths
Net migration
+42
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 Lake 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
Marquette CountyWisconsin31 mi15,927
Fond du Lac CountyWisconsin18 mi104,669
Waushara CountyWisconsin14 mi25,223
Columbia CountyWisconsin13 mi58,132
Winnebago CountyWisconsin6.1 mi174,218
Dodge CountyWisconsin6.1 mi89,097

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.