17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fremont | 1 | 15,752 | 15,902 | -0.19% | 1,848 | 9 | City |
| Clyde | 2 | 6,355 | 6,310 | 0.14% | 1,216 | 5 | City |
| Ballville | 3 | 6,011 | 6,030 | 0.12% | 179 | 34 | Township |
| Green Creek | 4 | 3,548 | 3,496 | 0.54% | 118 | 30 | Township |
| Woodville | 5 | 3,334 | 3,293 | 0.51% | 101 | 33 | Township |
| Gibsonburg | 6 | 2,476 | 2,485 | -0.08% | 1,067 | 2 | Village |
| York | 7 | 2,423 | 2,431 | 0.12% | 74 | 33 | Township |
| Washington | 8 | 2,278 | 2,288 | 0.09% | 47 | 49 | Township |
| Woodville | 9 | 1,973 | 2,002 | -0.3% | 1,464 | 1 | Village |
| Townsend | 10 | 1,540 | 1,532 | 0.33% | 47 | 32 | Township |
| Rice | 11 | 1,240 | 1,241 | 0.16% | 58 | 21 | Township |
| Riley | 12 | 1,120 | 1,120 | 0.27% | 29 | 38 | Township |
| Lindsey | 13 | 452 | 456 | -0.22% | 289 | 2 | Village |
| Vickery | 14 | 267 | 114 | 3.49% | 631 | 0 | CDP |
| Helena | 15 | 208 | 210 | 0% | 715 | 0 | Village |
| Burgoon | 16 | 176 | 181 | -0.56% | 1,275 | 0 | Village |
| Hessville | 17 | 21 | 84 | -38.24% | 30 | 1 | CDP |
Fremont is the largest city in Sandusky County, with a population of 15,752.
Hessville is the smallest city in Sandusky County, with a population of 21.
There are 17 cities in Sandusky County, Ohio.