26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Waukesha | 1 | 69,954 | 71,183 | -0.35% | 2,741 | 25.52 | City |
| Brookfield | 2 | 42,151 | 41,483 | 0.32% | 1,543 | 27.32 | City |
| Menomonee Falls | 3 | 40,438 | 38,593 | 0.92% | 1,229 | 32.90 | Village |
| New Berlin | 4 | 40,112 | 40,482 | -0.18% | 1,101 | 36.43 | City |
| Muskego | 5 | 25,464 | 25,084 | 0.3% | 806 | 31.60 | City |
| Oconomowoc | 6 | 18,973 | 18,245 | 0.78% | 1,613 | 11.76 | City |
| Pewaukee | 7 | 16,531 | 15,936 | 0.73% | 846 | 19.54 | City |
| Sussex | 8 | 12,513 | 11,635 | 1.43% | 1,484 | 8.43 | Village |
| Hartland | 9 | 10,437 | 9,507 | 1.81% | 1,912 | 5.46 | Village |
| Mukwonago | 10 | 8,641 | 8,268 | 0.88% | 1,076 | 8.03 | Village |
| Waukesha | 11 | 8,496 | 8,466 | 0.07% | 413 | 20.58 | Village |
| Pewaukee | 12 | 8,165 | 8,239 | -0.18% | 1,982 | 4.12 | Village |
| Delafield | 13 | 7,209 | 7,193 | 0.04% | 766 | 9.41 | City |
| Elm Grove | 14 | 6,182 | 6,517 | -1.07% | 1,896 | 3.26 | Village |
| Summit | 15 | 5,595 | 4,824 | 2.83% | 271 | 20.66 | Village |
| Okauchee Lake | 16 | 4,757 | 4,373 | 0.46% | 1,274 | 3.73 | CDP |
| Merton | 17 | 3,638 | 3,457 | 1% | 1,097 | 3.32 | Village |
| Wales | 18 | 2,995 | 2,875 | 0.81% | 929 | 3.23 | Village |
| Lannon | 19 | 2,906 | 1,366 | 11.86% | 1,176 | 2.47 | Village |
| Dousman | 20 | 2,410 | 2,429 | -0.17% | 809 | 2.98 | Village |
| North Prairie | 21 | 2,194 | 2,203 | -0.09% | 797 | 2.75 | Village |
| Eagle | 22 | 2,191 | 2,078 | 1.06% | 1,575 | 1.39 | Village |
| Butler | 23 | 1,752 | 1,786 | -0.4% | 2,240 | 0.78 | Village |
| Big Bend | 24 | 1,502 | 1,499 | 0.07% | 462 | 3.25 | Village |
| Nashotah | 25 | 1,304 | 1,319 | -0.23% | 801 | 1.63 | Village |
| North Lake | 26 | 261 | 300 | 6.97% | 1,092 | 0.24 | CDP |
Waukesha is the largest city in Waukesha County, with a population of 69,954.
North Lake is the smallest city in Waukesha County.
There are 26 cities in Waukesha County, Wisconsin.