20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Canton | 1 | 12,613 | 13,268 | -1.03% | 1,503 | 8.39 | City |
| Farmington | 2 | 2,248 | 2,385 | -1.19% | 1,494 | 1.50 | City |
| Lewistown | 3 | 1,915 | 2,037 | -1.24% | 958 | 2 | City |
| Cuba | 4 | 1,114 | 1,179 | -1.15% | 2,052 | 0.54 | City |
| Astoria | 5 | 868 | 925 | -1.25% | 1,481 | 0.59 | Town |
| Avon | 6 | 659 | 701 | -1.2% | 1,484 | 0.44 | Village |
| Vermont | 7 | 550 | 570 | -0.72% | 437 | 1.26 | Village |
| St. David | 8 | 495 | 525 | -1.2% | 1,533 | 0.32 | Village |
| Ipava | 9 | 417 | 442 | -1.19% | 1,556 | 0.27 | Village |
| Fairview | 10 | 404 | 426 | -0.98% | 96 | 4.21 | Village |
| London Mills | 11 | 337 | 349 | -0.59% | 493 | 0.68 | Village |
| Table Grove | 12 | 325 | 349 | -1.52% | 1,152 | 0.28 | Village |
| Dunfermline | 13 | 248 | 262 | -1.2% | 1,687 | 0.15 | Village |
| Smithfield | 14 | 182 | 189 | -0.55% | 391 | 0.47 | Village |
| Banner | 15 | 163 | 168 | -0.61% | 126 | 1.29 | Village |
| Bryant | 16 | 163 | 168 | -0.61% | 657 | 0.25 | Village |
| Norris | 17 | 163 | 173 | -1.21% | 576 | 0.28 | Village |
| Marietta | 18 | 96 | 103 | -1.03% | 352 | 0.27 | Village |
| Ellisville | 19 | 88 | 88 | 0% | 325 | 0.27 | Village |
| Liverpool | 20 | 88 | 93 | -1.12% | 1,048 | 0.08 | Village |
Canton is the largest city in Fulton County, with a population of 12,613.
Liverpool is the smallest city in Fulton County.
There are 20 cities in Fulton County, Illinois.