11 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fond du Lac | 1 | 44,366 | 44,674 | -0.11% | 2,306 | 19 | City |
| Ripon | 2 | 7,647 | 7,853 | -0.44% | 1,537 | 5 | City |
| North Fond du Lac | 3 | 5,437 | 5,383 | 0.17% | 2,555 | 2 | Village |
| Campbellsport | 4 | 2,044 | 1,903 | 1.19% | 1,496 | 1 | Village |
| Oakfield | 5 | 1,068 | 1,055 | 0.19% | 1,086 | 1 | Village |
| Rosendale | 6 | 1,034 | 1,042 | -0.1% | 831 | 1 | Village |
| Eden | 7 | 911 | 889 | 0.44% | 1,523 | 1 | Village |
| Brandon | 8 | 875 | 881 | -0.11% | 1,157 | 1 | Village |
| St. Cloud | 9 | 495 | 489 | 0.2% | 538 | 1 | Village |
| Mount Calvary | 10 | 488 | 487 | 0% | 462 | 1 | Village |
| Fairwater | 11 | 345 | 351 | -0.29% | 469 | 1 | Village |
Fond du Lac is the largest city in Fond du Lac County, with a population of 44,366.
Fairwater is the smallest city in Fond du Lac County, with a population of 345.
There are 11 cities in Fond du Lac County, Wisconsin.