8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Upper Sandusky | 1 | 6,596 | 6,689 | -0.23% | 977 | 7 | City |
| Carey | 2 | 3,455 | 3,559 | -0.49% | 1,600 | 2 | Village |
| Sycamore | 3 | 755 | 794 | -0.79% | 1,185 | 1 | Village |
| Nevada | 4 | 681 | 704 | -0.58% | 664 | 1 | Village |
| Wharton | 5 | 309 | 327 | -0.96% | 246 | 1 | Village |
| Harpster | 6 | 153 | 161 | -0.65% | 78 | 2 | Village |
| Kirby | 7 | 112 | 118 | -0.88% | 1,037 | 0 | Village |
| Marseilles | 8 | 92 | 97 | -1.08% | 939 | 0 | Village |
Upper Sandusky is the largest city in Wyandot County, with a population of 6,596.
Marseilles is the smallest city in Wyandot County, with a population of 92.
There are 8 cities in Wyandot County, Ohio.