County outline
Where Kewaunee County is located
Area breakdown
Land accounts for 31.6% of Kewaunee County’s measured area and water for 68.4%. Its combined area converts to 2,808.3 square kilometers or approximately 693,943 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 342.453 | 886.949 | 219,169.9 |
| Water | 741.833 | 1,921.339 | 474,773.1 |
| Total | 1,084.286 | 2,808.288 | 693,943 |
How Kewaunee County compares
By original Census land area, Kewaunee County ranks #66 of 72 in Wisconsin and #2703 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.455 times the Wisconsin county-equivalent median of 753 square miles. It accounts for 0.6% of the combined county land area in the state.
See the complete Wisconsin ranking · What counts as a county equivalent?
Population and density of Kewaunee County
The Census Bureau estimates that 20,758 people lived in Kewaunee County on July 1, 2025. That ranks #1,848 of 3,222 county equivalents nationally and #52 of 72 in Wisconsin. Since the April 1, 2020 estimates base of 20,559, the population has grown by 199 (+1%), compared with +1.3% for Wisconsin as a whole.
With 342.5 square miles of land, that is 61 people per square mile (23 per km²), placing Kewaunee County #1,376 nationally for density and #32 in Wisconsin. The median county equivalent has 47 people per square mile; the Wisconsin median is 51. Put another way, there are about 11 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 20,552 | 20,580 | 20,708 | 20,772 | 20,769 | 20,758 |
| Change | — | +28 | +128 | +64 | −3 | −11 |
U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.
Cities and towns in Kewaunee County
Kewaunee County is divided into 14 cities and towns. In Wisconsin, county subdivisions are local governments, and together they cover all of the county’s land and residents.
The most populous is Algoma city, with 3,225 residents (15.5% of the county). The largest by land is West Kewaunee town, at 36.9 mi², or 10.8% of the county’s land. The county seat, Kewaunee city, has 2,793 residents. Among those with at least 1,000 residents in 2020, Luxemburg village grew fastest since then (+3.7%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Algoma city | 3,225 | −0.6% | 2.455 | 0.7% |
| Kewaunee cityCounty seat | 2,793 | −1.1% | 3.531 | 1% |
| Luxemburg village | 2,784 | +3.7% | 2.445 | 0.7% |
| Luxemburg town | 1,468 | +0.5% | 33.9 | 9.9% |
| Red River town | 1,387 | +1% | 34.7 | 10.1% |
| Montpelier town | 1,375 | +0.5% | 36.1 | 10.5% |
| West Kewaunee town | 1,289 | +0.7% | 36.9 | 10.8% |
| Casco town | 1,170 | +1.5% | 35.6 | 10.4% |
| Carlton town | 1,016 | +0.2% | 35.6 | 10.4% |
| Franklin town | 974 | +1.2% | 35.5 | 10.4% |
| Lincoln town | 933 | −0.3% | 35.8 | 10.4% |
| Ahnapee town | 882 | +1.5% | 30.8 | 9% |
| Pierce town | 770 | +0.8% | 18.5 | 5.4% |
| Casco village | 692 | +10.2% | 0.666 | 0.2% |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Kewaunee County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Kewaunee County is an outlying county of the Green Bay, WI Metropolitan Statistical Area. Its 3 county equivalents have 336,756 residents on 1,870 square miles of land; Kewaunee County accounts for 18.3% of the land and 6.2% of the residents. By combined land it ranks #167 of 393 metropolitan areas, and #162 by population. It belongs to the Green Bay-Shawano, WI Combined Statistical Area.
| County equivalent | Population 2025 | Land mi² |
|---|---|---|
| Brown County | 275,803 | 530.1 |
| Oconto County | 40,195 | 997.5 |
| Kewaunee County | 20,758 | 342.5 |
ZIP codes
6 ZIP Code Tabulation Areas have land in Kewaunee County; 4 of them have most of their land inside the county, and the others mainly cover neighboring areas.
542015420554208542135421654217
ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.
Counties bordering Kewaunee County
Kewaunee County shares a land border with 3 county equivalents. Each of them has more land than Kewaunee County. The largest neighbor is Manitowoc County (589.3 mi²) and the smallest is Door County (481.9 mi²). Together with its neighbors, Kewaunee County forms a block of 1,943.8 mi² of land, of which it holds 17.6%.
| Bordering county equivalent | Land mi² | Size vs. Kewaunee | Compare |
|---|---|---|---|
| Manitowoc County | 589.3 | 1.7× larger | Compare |
| Brown County | 530.1 | 1.5× larger | Compare |
| Door County | 481.9 | 1.4× larger | Compare |
How big is Kewaunee County compared with U.S. states?
Kewaunee County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 3 times as much. Wisconsin’s county land could hold about 158 areas the size of Kewaunee County.
Another way to picture it: the same land area would fill a square about 18.5 miles (29.8 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.
State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.
What stands out about Kewaunee County?
Kewaunee County has more land than 519 of the other 3,221 county equivalents in the dataset.
A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.
Does including water change its rank?
Using land plus water places Kewaunee County at #681 nationally by total area, 2,022 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.
Its water share is 68.4%, compared with a national county-equivalent median of 1.2% — 67.2 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.
Closest positions in the national land ranking
These entries sit immediately beside Kewaunee County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #2702 | Atkinson County, Georgia | 342.7 | Compare |
| #2703 | Kewaunee County, Wisconsin | 342.5 | This county |
| #2704 | Baker County, Georgia | 342 | Compare |
Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.
Representative coordinates
The Census internal point is 44.605677, -87.448008. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.
Source and precision
U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 886,948,869 m²; AWATER: 1,921,339,184 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.
Common questions
How big is Kewaunee County?
Kewaunee County, Wisconsin has 342.5 square miles (886.9 km²) of land and 741.8 square miles of water, for a total area of 1,084.3 square miles. It ranks #2703 of 3,222 U.S. county equivalents by land area.
Is Kewaunee County the largest county in Wisconsin?
No. Kewaunee County ranks #66 of 72 in Wisconsin by land area. The largest is Marathon County, with 1,545.2 square miles of land.
What counties border Kewaunee County?
Kewaunee County shares a land border with Brown County, Door County, and Manitowoc County.
What is the population of Kewaunee County?
The Census Bureau estimates Kewaunee County had 20,758 residents on July 1, 2025, ranking #1,848 of 3,222 county equivalents. That is 61 people per square mile of land.
What is the county seat of Kewaunee County?
The county seat of Kewaunee County is Kewaunee.
What cities and towns are in Kewaunee County?
Kewaunee County has 14 county subdivisions (cities, towns and townships). The most populous five are Algoma city, Kewaunee city, Luxemburg village, Luxemburg town, and Red River town.
Is Kewaunee County part of a metropolitan area?
Yes. It is an outlying county of the Green Bay, WI Metropolitan Statistical Area, which has 3 county equivalents and 336,756 residents.
How many ZIP codes are in Kewaunee County?
6 ZIP Code Tabulation Areas have land in Kewaunee County, and 4 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Kewaunee County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 3 times as much land.
How many acres of land are in Kewaunee County?
The land measurement converts to approximately 219,170 acres. Including water, total area is approximately 693,943 acres. One square mile equals 640 acres.
Why might another source show a different area?
Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.
Can this establish a property boundary?
No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.