Identifiers: city · CDP · village
| Rank | Community | Population |
|---|---|---|
| 1 | Watertown (city), WI | 22,926 |
| 2 | Oconomowoc (city), WI | 18,203 |
| 3 | Jefferson (city), WI | 7,793 |
| 4 | Lake Mills (city), WI | 6,211 |
| 5 | Okauchee Lake (CDP), WI | 5,094 |
| 6 | Summit (village), WI | 4,784 |
| 7 | Horicon (city), WI | 3,767 |
| 8 | Waterloo (city), WI | 3,492 |
| 9 | Johnson Creek (village), WI | 3,318 |
| 10 | Juneau (city), WI | 2,658 |
| 11 | Ixonia (CDP), WI | 2,367 |
| 12 | Nashotah (village), WI | 1,321 |
| 13 | Ashippun (CDP), WI | 1,166 |
| 14 | Hustisford (village), WI | 1,101 |
| 15 | Reeseville (village), WI | 763 |
| 16 | Oconomowoc Lake (village), WI | 566 |
| 17 | Chenequa (village), WI | 526 |
| 18 | Clyman (village), WI | 397 |
| 19 | Lowell (village), WI | 309 |
| 20 | Lac La Belle (village), WI | 281 |