| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Upper Sandusky | 1 | 6,645 | 6,704 | -0.24% | 984 | 7 | City |
| Carey | 2 | 3,519 | 3,561 | -0.28% | 1,630 | 2 | Village |
| Sycamore | 3 | 766 | 793 | -0.65% | 1,203 | 1 | Village |
| Nevada | 4 | 696 | 707 | -0.29% | 678 | 1 | Village |
| Wharton | 5 | 317 | 329 | -0.94% | 252 | 1 | Village |
| Harpster | 6 | 153 | 161 | -1.29% | 78 | 2 | Village |
| Kirby | 7 | 115 | 119 | -0.86% | 1,065 | 0 | Village |
| Marseilles | 8 | 94 | 97 | -1.05% | 959 | 0 | Village |
Upper Sandusky is the largest city in Wyandot County, with a population of 6,645.
Marseilles is the smallest city in Wyandot County, with a population of 94.
There are 8 cities in Wyandot County, Ohio.