18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Whitewater | 1 | 15,289 | 16,134 | -1.09% | 1,730 | 8.84 | City |
| Elkhorn | 2 | 10,205 | 10,267 | -0.12% | 1,263 | 8.08 | City |
| Lake Geneva | 3 | 8,940 | 8,299 | 1.45% | 1,303 | 6.86 | City |
| Delavan | 4 | 8,521 | 8,525 | -0.01% | 1,150 | 7.41 | City |
| East Troy | 5 | 4,719 | 4,689 | 0.13% | 1,034 | 4.56 | Village |
| Delavan Lake | 6 | 2,995 | 2,752 | 0.77% | 712 | 4.20 | CDP |
| Williams Bay | 7 | 2,993 | 2,963 | 0.2% | 1,081 | 2.77 | Village |
| Genoa City | 8 | 2,925 | 2,982 | -0.37% | 1,105 | 2.65 | Village |
| Walworth | 9 | 2,827 | 2,767 | 0.43% | 1,646 | 1.72 | Village |
| Como | 10 | 2,228 | 2,064 | -1.2% | 792 | 2.81 | CDP |
| Fontana-on-Geneva Lake | 11 | 1,902 | 1,871 | 0.32% | 567 | 3.36 | Village |
| Lauderdale Lakes | 12 | 1,687 | 1,437 | 2.06% | 393 | 4.30 | CDP |
| Darien | 13 | 1,567 | 1,574 | -0.06% | 1,214 | 1.29 | Village |
| Sharon | 14 | 1,551 | 1,586 | -0.45% | 897 | 1.73 | Village |
| Lyons | 15 | 1,469 | 1,117 | 7.15% | 1,180 | 1.25 | CDP |
| Lake Lorraine | 16 | 282 | 259 | -0.7% | 252 | 1.12 | CDP |
| Springfield | 17 | 159 | 131 | 0% | 236 | 0.67 | CDP |
| Big Foot Prairie | 18 | 124 | 77 | 6.9% | 3,875 | 0.03 | CDP |
Whitewater is the largest city in Walworth County, with a population of 15,289.
Big Foot Prairie is the smallest city in Walworth County.
There are 18 cities in Walworth County, Wisconsin.