11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fond du Lac | 1 | 44,417 | 44,674 | -0.12% | 2,309 | 19 | City |
| Ripon | 2 | 7,681 | 7,853 | -0.45% | 1,544 | 5 | City |
| North Fond du Lac | 3 | 5,428 | 5,383 | 0.17% | 2,551 | 2 | Village |
| Campbellsport | 4 | 2,020 | 1,903 | 1.15% | 1,479 | 1 | Village |
| Oakfield | 5 | 1,066 | 1,055 | 0.19% | 1,084 | 1 | Village |
| Rosendale | 6 | 1,035 | 1,042 | -0.19% | 831 | 1 | Village |
| Eden | 7 | 907 | 889 | 0.33% | 1,517 | 1 | Village |
| Brandon | 8 | 876 | 881 | -0.11% | 1,159 | 1 | Village |
| St. Cloud | 9 | 494 | 489 | 0.2% | 537 | 1 | Village |
| Mount Calvary | 10 | 488 | 487 | 0% | 462 | 1 | Village |
| Fairwater | 11 | 346 | 351 | -0.29% | 471 | 1 | Village |
Fond du Lac is the largest city in Fond du Lac County, with a population of 44,417.
Fairwater is the smallest city in Fond du Lac County, with a population of 346.
There are 11 cities in Fond du Lac County, Wisconsin.