20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Swan Creek township | 1 | 8,352 | 8,521 | -0.44% | 199 | 42.05 | Township |
| Fayette township | 2 | 8,092 | 8,495 | -0.75% | 295 | 27.43 | Township |
| Wauseon | 3 | 7,366 | 7,558 | -0.51% | 1,385 | 5.32 | City |
| German township | 4 | 6,423 | 6,570 | -0.37% | 127 | 50.47 | Township |
| Archbold | 5 | 4,403 | 4,512 | -0.5% | 893 | 4.93 | Village |
| York township | 6 | 4,124 | 4,255 | -0.53% | 98 | 42.10 | Township |
| Swanton | 7 | 3,836 | 3,886 | -0.26% | 1,129 | 3.40 | Village |
| Delta | 8 | 3,295 | 3,309 | -0.09% | 1,044 | 3.15 | Village |
| Swanton township | 9 | 2,833 | 2,823 | 0.04% | 129 | 22.04 | Township |
| Gorham township | 10 | 2,130 | 2,167 | -0.14% | 49 | 43.25 | Township |
| Amboy township | 11 | 1,818 | 1,877 | -0.55% | 70 | 25.82 | Township |
| Pike township | 12 | 1,694 | 1,746 | -0.53% | 60 | 28.07 | Township |
| Royalton township | 13 | 1,461 | 1,506 | -0.48% | 60 | 24.51 | Township |
| Fayette | 14 | 1,273 | 1,303 | -0.47% | 1,307 | 0.97 | Village |
| Chesterfield township | 15 | 895 | 922 | -0.44% | 31 | 29 | Township |
| Ai | 16 | 668 | 386 | 7.22% | 884 | 0.76 | CDP |
| Lyons | 17 | 581 | 603 | -0.68% | 821 | 0.71 | Village |
| Metamora | 18 | 542 | 564 | -0.73% | 663 | 0.82 | Village |
| Pettisville | 19 | 536 | 546 | 0.56% | 563 | 0.95 | CDP |
| Tedrow | 20 | 269 | 209 | 2.28% | 838 | 0.32 | CDP |
Swan Creek township is the largest city in Fulton County, with a population of 8,352.
Tedrow is the smallest city in Fulton County.
There are 20 cities in Fulton County, Ohio.