8 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Upper Sandusky | 1 | 6,617 | 6,691 | -0.23% | 980 | 6.75 | City |
| Carey | 2 | 3,446 | 3,558 | -0.63% | 1,596 | 2.16 | Village |
| Sycamore | 3 | 757 | 794 | -0.92% | 1,188 | 0.64 | Village |
| Nevada | 4 | 685 | 705 | -0.58% | 668 | 1.03 | Village |
| Wharton | 5 | 313 | 327 | -0.95% | 249 | 1.26 | Village |
| Harpster | 6 | 152 | 161 | -1.3% | 77 | 1.97 | Village |
| Kirby | 7 | 111 | 116 | -0.89% | 1,028 | 0.11 | Village |
| Marseilles | 8 | 92 | 97 | -1.07% | 939 | 0.10 | Village |
Upper Sandusky is the largest city in Wyandot County, with a population of 6,617.
Marseilles is the smallest city in Wyandot County.
There are 8 cities in Wyandot County, Ohio.