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Sumner

A town of 846 people in Jefferson County, Wisconsin
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Around town

The places and views that make it Sumner

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Outdoors in Sumner

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Conserved land0.5%103 of 19,992 acres
Trails1.5 mi0 mi per sq mi
Parks & preserves2named on the map

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Trails & parks © OpenStreetMap contributors · Conserved land: USGS PAD-US

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Know Sumner

The town at a glance, and the guide to how things work

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About Sumner

Town in Wisconsin, United States
846Population
31.3 sq miArea
797 ftElevation

Sumner is a town in Jefferson County, Wisconsin, United States. The population was 846 at the 2020 census. The census-designated place of Lake Koshkonong and the unincorporated communities of Busseyville, Carcajou, Glenn Oaks Beach, Koshkonong Manor, and North Shore are located within the town. The community of Blackhawk Island is located partially in the town.

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Town numbers

Living in Sumner

Health in Sumner

Compared with Wisconsin

≈Just like Wisconsin

No difference on any of 32 measures is outside the margin of error.

BetterToo close to callWorse

What stands out

Nothing stands out: Sumner tracks Wisconsin closely.

Care nearby

Edgerton Hospital and Health ServicesEdgerton · 4.7 mi · ER · rural critical access
Rock River Community Clinic - WhitewaterWhitewater · 11.6 mi · sliding-scale fees
Primary careNo shortage
DentalNo shortage
Mental healthNo shortage
CDC PLACES 2025 · modeled estimates for adults · ZIP codes 53538, 53534, 53523 · CMS · HRSAHealth in Sumner →

Natural hazards in Sumner

67
High

Expected storm and flood damage is higher than in 67% of U.S. communities.

🌊 Inland flooding🌪️ Tornadoes🥶 Cold waves
FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Sumner →

Libraries near Sumner

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Nearest: Edgerton Public LibraryEdgerton · 5.6 miles · 65 hrs a week

Famous people from Sumner

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Where Sumner is

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Locator map of Sumner
Wikimedia Commons · Map: The original uploader was Bumm13 at English Wikipedia. · CC BY-SA 3.0

Location map

Wisconsin · WI · Jefferson CountyTown boundary on OpenStreetMap →

How things work in Sumner

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You’re in Sumner, WIJefferson CountyView boundary

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/15 · 2025-01-01