43 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Avon township | 1 | 62,389 | 63,588 | -0.34% | 2,780 | 22.44 | Township |
| Cuba township | 2 | 16,993 | 17,247 | -0.37% | 744 | 22.82 | Township |
| Canton township | 3 | 13,448 | 14,178 | -1.16% | 387 | 34.74 | Township |
| Canton | 4 | 12,613 | 13,268 | -1.03% | 1,503 | 8.39 | City |
| Farmington township | 5 | 3,018 | 3,204 | -1.37% | 85 | 35.69 | Township |
| Lewistown township | 6 | 2,505 | 2,659 | -1.34% | 71 | 35.50 | Township |
| Farmington | 7 | 2,248 | 2,385 | -1.19% | 1,494 | 1.50 | City |
| Lewistown | 8 | 1,915 | 2,037 | -1.24% | 958 | 2 | City |
| Putman township | 9 | 1,865 | 1,971 | -1.32% | 56 | 33.60 | Township |
| Buckheart township | 10 | 1,251 | 1,318 | -1.18% | 36 | 34.76 | Township |
| Astoria township | 11 | 1,169 | 1,239 | -1.27% | 32 | 36.19 | Township |
| Cuba | 12 | 1,114 | 1,179 | -1.15% | 2,052 | 0.54 | City |
| Astoria | 13 | 868 | 925 | -1.25% | 1,481 | 0.59 | Town |
| Vermont township | 14 | 784 | 824 | -1.38% | 21 | 36.67 | Township |
| Pleasant township | 15 | 680 | 720 | -1.31% | 18 | 37.19 | Township |
| Avon | 16 | 659 | 701 | -1.2% | 1,484 | 0.44 | Village |
| Fairview township | 17 | 595 | 628 | -1.33% | 17 | 35.54 | Township |
| Vermont | 18 | 550 | 570 | -0.72% | 437 | 1.26 | Village |
| Liverpool township | 19 | 537 | 562 | -1.1% | 13 | 40.26 | Township |
| Cass township | 20 | 524 | 551 | -1.32% | 13 | 39.40 | Township |
| Young Hickory township | 21 | 521 | 544 | -1.14% | 22 | 24.22 | Township |
| St. David | 22 | 495 | 525 | -1.2% | 1,533 | 0.32 | Village |
| Ipava | 23 | 417 | 442 | -1.18% | 1,556 | 0.27 | Village |
| Joshua township | 24 | 412 | 433 | -1.44% | 12 | 34.83 | Township |
| Fairview | 25 | 404 | 426 | -0.98% | 96 | 4.21 | Village |
| Farmers township | 26 | 343 | 362 | -1.15% | 10 | 36.01 | Township |
| London Mills | 27 | 337 | 349 | -0.59% | 493 | 0.68 | Village |
| Table Grove | 28 | 325 | 349 | -1.52% | 1,152 | 0.28 | Village |
| Banner township | 29 | 317 | 325 | -0.63% | 11 | 28.50 | Township |
| Harris township | 30 | 301 | 317 | -1.31% | 9 | 34.17 | Township |
| Dunfermline | 31 | 248 | 262 | -1.2% | 1,687 | 0.15 | Village |
| Bernadotte township | 32 | 242 | 254 | -1.22% | 6 | 37.69 | Township |
| Smithfield | 33 | 182 | 189 | -0.55% | 391 | 0.47 | Village |
| Isabel township | 34 | 167 | 174 | -1.18% | 6 | 29.23 | Township |
| Banner | 35 | 163 | 168 | -0.61% | 126 | 1.29 | Village |
| Bryant | 36 | 163 | 168 | -0.61% | 657 | 0.25 | Village |
| Norris | 37 | 163 | 173 | -1.21% | 576 | 0.28 | Village |
| Waterford township | 38 | 153 | 160 | -1.29% | 7 | 20.96 | Township |
| Ellisville township | 39 | 147 | 153 | -1.34% | 11 | 13.89 | Township |
| Marietta | 40 | 96 | 103 | -1.03% | 352 | 0.27 | Village |
| Ellisville | 41 | 88 | 88 | 0% | 325 | 0.27 | Village |
| Liverpool | 42 | 88 | 93 | -1.12% | 1,048 | 0.08 | Village |
| Kerton township | 43 | 81 | 85 | -1.22% | 3 | 24.30 | Township |
Avon township is the largest city in Fulton County, with a population of 62,389.
Kerton township is the smallest city in Fulton County.
There are 43 cities in Fulton County, Illinois.