20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Swan Creek | 1 | 8,434 | 8,521 | 0.09% | 201 | 42 | Township |
| Fayette | 2 | 8,120 | 8,493 | -0.54% | 296 | 27 | Township |
| Wauseon | 3 | 7,429 | 7,558 | -0.35% | 1,396 | 5 | City |
| German | 4 | 6,480 | 6,568 | 0.15% | 128 | 50 | Township |
| Archbold | 5 | 4,428 | 4,511 | -0.38% | 898 | 5 | Village |
| York | 6 | 4,161 | 4,255 | 0% | 99 | 42 | Township |
| Swanton | 7 | 3,884 | 3,889 | -0.03% | 1,143 | 3 | Village |
| Delta | 8 | 3,309 | 3,321 | -0.09% | 1,049 | 3 | Village |
| Swanton | 9 | 2,855 | 2,823 | 0.32% | 130 | 22 | Township |
| Gorham | 10 | 2,128 | 2,166 | -0.05% | 49 | 43 | Township |
| Amboy | 11 | 1,834 | 1,874 | 0% | 71 | 26 | Township |
| Pike | 12 | 1,716 | 1,747 | 0.06% | 61 | 28 | Township |
| Royalton | 13 | 1,476 | 1,505 | 0.14% | 60 | 25 | Township |
| Fayette | 14 | 1,276 | 1,304 | -0.47% | 1,310 | 1 | Village |
| Chesterfield | 15 | 914 | 922 | 0.33% | 32 | 29 | Township |
| Ai | 16 | 668 | 386 | 7.22% | 884 | 1 | CDP |
| Lyons | 17 | 585 | 602 | -0.68% | 826 | 1 | Village |
| Metamora | 18 | 549 | 564 | -0.54% | 672 | 1 | Village |
| Pettisville | 19 | 536 | 546 | 0.56% | 563 | 1 | CDP |
| Tedrow | 20 | 269 | 209 | 2.28% | 838 | 0 | CDP |
Swan Creek is the largest city in Fulton County, with a population of 8,434.
Tedrow is the smallest city in Fulton County, with a population of 269.
There are 20 cities in Fulton County, Ohio.