15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fond Lac | 1 | 44,026 | 44,711 | -0.31% | 2,289 | 19 | City |
| Ripon | 2 | 7,710 | 7,850 | -0.36% | 1,550 | 5 | City |
| North Fond Lac | 3 | 5,356 | 5,381 | -0.09% | 2,517 | 2 | Village |
| Campbellsport | 4 | 1,954 | 1,904 | 0.51% | 1,430 | 1 | Village |
| Oakfield | 5 | 1,059 | 1,054 | 0.09% | 1,077 | 1 | Village |
| Rosendale | 6 | 1,026 | 1,043 | -0.29% | 824 | 1 | Village |
| Eden | 7 | 910 | 887 | 0.55% | 1,522 | 1 | Village |
| Butte Morts | 8 | 893 | 981 | -0.56% | 724 | 1 | CDP |
| Brandon | 9 | 862 | 881 | -0.46% | 1,140 | 1 | Village |
| Van Dyne | 10 | 830 | 236 | 4.53% | 1,053 | 1 | CDP |
| Taycheedah | 11 | 579 | 652 | -1.36% | 739 | 1 | CDP |
| St. Cloud | 12 | 491 | 491 | 0% | 534 | 1 | Village |
| Mount Calvary | 13 | 484 | 491 | -0.21% | 458 | 1 | Village |
| Fairwater | 14 | 337 | 346 | -0.59% | 459 | 1 | Village |
| Alto | 15 | 131 | 171 | 7.38% | 166 | 1 | CDP |
Fond Lac is the largest city in Fond du Lac County, with a population of 44,026.
Alto is the smallest city in Fond du Lac County, with a population of 131.
There are 15 cities in Fond du Lac County, Wisconsin.