| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fond du Lac | 1 | 44,532 | 44,709 | -0.02% | 2,315 | 19 | City |
| Ripon | 2 | 7,711 | 7,858 | -0.35% | 1,550 | 5 | City |
| North Fond du Lac | 3 | 5,439 | 5,347 | 0.26% | 2,556 | 2 | Village |
| Campbellsport | 4 | 2,059 | 1,905 | 1.23% | 1,507 | 1 | Village |
| Oakfield | 5 | 1,068 | 1,055 | 0.28% | 1,086 | 1 | Village |
| Rosendale | 6 | 1,042 | 1,046 | 0% | 837 | 1 | Village |
| Eden | 7 | 921 | 890 | 0.44% | 1,540 | 1 | Village |
| Brandon | 8 | 874 | 881 | -0.11% | 1,156 | 1 | Village |
| Mount Calvary | 9 | 492 | 490 | 0% | 466 | 1 | Village |
| St. Cloud | 10 | 492 | 489 | 0.2% | 535 | 1 | Village |
| Fairwater | 11 | 350 | 350 | -0.28% | 476 | 1 | Village |
Fond du Lac is the largest city in Fond du Lac County, with a population of 44,532.
Fairwater is the smallest city in Fond du Lac County, with a population of 350.
There are 11 cities in Fond du Lac County, Wisconsin.