20 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sycamore | 1 | 19,854 | 19,573 | 0.63% | 2,951 | 7 | Township |
| Crane | 2 | 7,418 | 7,553 | -0.31% | 189 | 39 | Township |
| Upper Sandusky | 3 | 6,596 | 6,689 | -0.23% | 977 | 7 | City |
| Crawford | 4 | 4,508 | 4,623 | -0.16% | 125 | 36 | Township |
| Carey | 5 | 3,455 | 3,559 | -0.49% | 1,600 | 2 | Village |
| Sycamore | 6 | 1,419 | 1,471 | -0.35% | 59 | 24 | Township |
| Antrim | 7 | 1,111 | 1,156 | -0.63% | 34 | 32 | Township |
| Tymochtee | 8 | 1,054 | 1,092 | -0.38% | 29 | 36 | Township |
| Eden | 9 | 975 | 1,007 | -0.41% | 32 | 30 | Township |
| Pitt | 10 | 870 | 908 | -0.46% | 22 | 39 | Township |
| Richland | 11 | 805 | 847 | -0.74% | 27 | 30 | Township |
| Sycamore | 12 | 755 | 794 | -0.79% | 1,185 | 1 | Village |
| Mifflin | 13 | 741 | 768 | -0.4% | 20 | 36 | Township |
| Nevada | 14 | 681 | 704 | -0.58% | 664 | 1 | Village |
| Ridge | 15 | 492 | 509 | -0.4% | 33 | 15 | Township |
| Marseilles | 16 | 366 | 382 | -0.27% | 15 | 24 | Township |
| Wharton | 17 | 309 | 327 | -0.96% | 246 | 1 | Village |
| Harpster | 18 | 153 | 161 | -0.65% | 78 | 2 | Village |
| Kirby | 19 | 112 | 118 | -0.88% | 1,037 | 0 | Village |
| Marseilles | 20 | 92 | 97 | -1.08% | 939 | 0 | Village |
Sycamore is the largest city in Wyandot County, with a population of 19,854.
Marseilles is the smallest city in Wyandot County, with a population of 92.
There are 20 cities in Wyandot County, Ohio.