County outline
Where Walworth County is located
Area breakdown
Land accounts for 96.3% of Walworth County’s measured area and water for 3.7%. Its combined area converts to 1,493.4 square kilometers or approximately 369,021 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 555.436 | 1,438.573 | 355,479 |
| Water | 21.16 | 54.804 | 13,542.4 |
| Total | 576.596 | 1,493.377 | 369,021.4 |
How Walworth County compares
By original Census land area, Walworth County ranks #54 of 72 in Wisconsin and #1870 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.738 times the Wisconsin county-equivalent median of 753 square miles. It accounts for 1% of the combined county land area in the state.
See the complete Wisconsin ranking · What counts as a county equivalent?
Population and density of Walworth County
The Census Bureau estimates that 106,127 people lived in Walworth County on July 1, 2025. That ranks #599 of 3,222 county equivalents nationally and #15 of 72 in Wisconsin. Since the April 1, 2020 estimates base of 105,222, the population has grown by 905 (+0.9%), compared with +1.3% for Wisconsin as a whole.
With 555.4 square miles of land, that is 191 people per square mile (74 per km²), placing Walworth County #655 nationally for density and #14 in Wisconsin. The median county equivalent has 47 people per square mile; the Wisconsin median is 51. Put another way, there are about 3.3 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 105,324 | 105,273 | 105,843 | 106,192 | 106,123 | 106,127 |
| Change | — | −51 | +570 | +349 | −69 | +4 |
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 Walworth County
Walworth County is divided into 30 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 Whitewater city, with 11,557 residents (10.9% of the county). The largest by land is Spring Prairie town, at 35.8 mi², or 6.4% of the county’s land. The county seat, Elkhorn city, has 10,045 residents. Among those with at least 1,000 residents in 2020, Delavan city grew fastest since then (+8.5%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Whitewater city | 11,557 | −1.4% | 6.007 | 1.1% |
| Elkhorn cityCounty seat | 10,045 | −2.1% | 8.162 | 1.5% |
| Delavan city | 9,228 | +8.5% | 7.414 | 1.3% |
| Lake Geneva city | 8,818 | +6.4% | 6.989 | 1.3% |
| Bloomfield village | 6,369 | −1% | 30.3 | 5.5% |
| Geneva town | 5,443 | +1.3% | 28.5 | 5.1% |
| Delavan town | 5,210 | −1.3% | 24.3 | 4.4% |
| East Troy village | 4,988 | +6.3% | 4.571 | 0.8% |
| East Troy town | 4,002 | +0.1% | 27.7 | 5% |
| Sugar Creek town | 3,888 | −0.2% | 33 | 5.9% |
| Lyons town | 3,635 | −0.5% | 34.3 | 6.2% |
| Williams Bay village | 2,935 | −0.2% | 2.908 | 0.5% |
| Genoa City village | 2,863 | −3.1% | 2.636 | 0.5% |
| Walworth village | 2,759 | −0.1% | 1.721 | 0.3% |
| Linn town | 2,707 | +0.7% | 27.4 | 4.9% |
Show the other 15 subdivisions
| Name | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| La Grange town | 2,475 | +0.3% | 34.3 |
| Troy town | 2,331 | −1% | 34.8 |
| Spring Prairie town | 2,109 | −1.1% | 35.8 |
| Lafayette town | 2,077 | +1.6% | 34.2 |
| Fontana-on-Geneva Lake village | 1,886 | −0.8% | 3.358 |
| Richmond town | 1,883 | −0.5% | 35.4 |
| Darien town | 1,618 | −1.3% | 33.7 |
| Walworth town | 1,551 | −1.2% | 28 |
| Sharon village | 1,550 | −2.4% | 1.73 |
| Darien village | 1,530 | −2.9% | 1.517 |
| Whitewater town | 1,423 | −0.9% | 28.6 |
| Sharon town | 844 | −2% | 34.8 |
| Mukwonago village | 216 | +2.9% | 1.806 |
| Bloomfield town | 187 | +71.6% | 1.405 |
| Burlington city | 0 | — | 0.25 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Walworth County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Walworth County is a central county of the Whitewater-Elkhorn, WI Micropolitan Statistical Area. Walworth County is the area’s only county equivalent, so the micro area has the same 555.4 square miles of land. By combined land it ranks #392 of 542 micropolitan areas, and #27 by population. It belongs to the Milwaukee-Racine-Waukesha, WI Combined Statistical Area.
ZIP codes
18 ZIP Code Tabulation Areas have land in Walworth County; 13 of them have most of their land inside the county, and the others mainly cover neighboring areas.
531055311453115531195312053121531255312853147531495315753176531845319053191531955352553585
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 Walworth County
Walworth County shares a land border with 7 county equivalents, including 2 in Illinois. It has more land than 4 of them. The largest neighbor is Rock County (718.2 mi²) and the smallest is Kenosha County (271.8 mi²). Together with its neighbors, Walworth County forms a block of 3,868.4 mi² of land, of which it holds 14.4%.
| Bordering county equivalent | Land mi² | Size vs. Walworth | Compare |
|---|---|---|---|
| Rock County | 718.2 | 1.3× larger | Compare |
| McHenry CountyIllinois | 603.4 | 1.1× larger | Compare |
| Jefferson County | 556.5 | about the same | Compare |
| Waukesha County | 549.7 | about the same | Compare |
| Racine County | 332.6 | 1.7× smaller | Compare |
| Boone CountyIllinois | 280.7 | 2× smaller | Compare |
| Kenosha County | 271.8 | 2× smaller | Compare |
How big is Walworth County compared with U.S. states?
Walworth County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.9 times as much. Wisconsin’s county land could hold about 98 areas the size of Walworth County.
Another way to picture it: the same land area would fill a square about 23.6 miles (37.9 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 Walworth County?
Walworth County has more land than 1,352 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 Walworth County at #1,857 nationally by total area, 13 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 3.7%, compared with a national county-equivalent median of 1.2% — 2.5 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 Walworth County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1869 | Pointe Coupee Parish, Louisiana | 555.5 | Compare |
| #1870 | Walworth County, Wisconsin | 555.4 | This county |
| #1871 | Mecosta County, Michigan | 555.2 | 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 42.668110, -88.541731. 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: 1,438,572,740 m²; AWATER: 54,804,585 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 Walworth County?
Walworth County, Wisconsin has 555.4 square miles (1,438.6 km²) of land and 21.2 square miles of water, for a total area of 576.6 square miles. It ranks #1870 of 3,222 U.S. county equivalents by land area.
Is Walworth County the largest county in Wisconsin?
No. Walworth County ranks #54 of 72 in Wisconsin by land area. The largest is Marathon County, with 1,545.2 square miles of land.
What counties border Walworth County?
Walworth County shares a land border with Rock County, McHenry County, Illinois, Racine County, Jefferson County, Waukesha County, Kenosha County, and Boone County, Illinois.
What is the population of Walworth County?
The Census Bureau estimates Walworth County had 106,127 residents on July 1, 2025, ranking #599 of 3,222 county equivalents. That is 191 people per square mile of land.
What is the county seat of Walworth County?
The county seat of Walworth County is Elkhorn.
What cities and towns are in Walworth County?
Walworth County has 30 county subdivisions (cities, towns and townships). The most populous five are Whitewater city, Elkhorn city, Delavan city, Lake Geneva city, and Bloomfield village.
Is Walworth County part of a metropolitan area?
Yes. It is a central county of the Whitewater-Elkhorn, WI Micropolitan Statistical Area.
How many ZIP codes are in Walworth County?
18 ZIP Code Tabulation Areas have land in Walworth County, and 13 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Walworth County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 1.9 times as much land.
How many acres of land are in Walworth County?
The land measurement converts to approximately 355,479 acres. Including water, total area is approximately 369,021 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.