17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gloversville | 1 | 14,688 | 15,075 | -0.52% | 2,911 | 5.05 | City |
| Johnstown | 2 | 8,047 | 8,177 | -0.32% | 1,670 | 4.82 | City |
| Johnstown town | 3 | 6,336 | 6,779 | 0% | 90 | 70.36 | Town |
| Mayfield town | 4 | 6,088 | 6,129 | -0.05% | 104 | 58.38 | Town |
| Broadalbin town | 5 | 5,101 | 5,135 | 0.08% | 161 | 31.72 | Town |
| Perth town | 6 | 3,536 | 3,576 | -0.14% | 136 | 26.09 | Town |
| Northampton town | 7 | 2,493 | 2,473 | 0.24% | 118 | 21.11 | Town |
| Northville | 8 | 1,951 | 1,607 | 2.15% | 264 | 7.40 | CDP |
| Oppenheim town | 9 | 1,753 | 1,746 | 0.06% | 31 | 56.13 | Town |
| Ephratah town | 10 | 1,660 | 1,672 | 0% | 42 | 39.17 | Town |
| Broadalbin | 11 | 1,328 | 1,362 | -0.52% | 982 | 1.35 | Village |
| Caroga town | 12 | 1,260 | 1,256 | 0.24% | 25 | 50.63 | Town |
| Northville | 13 | 992 | 1,007 | -0.3% | 933 | 1.06 | Village |
| Mayfield | 14 | 775 | 789 | -0.39% | 770 | 1.01 | Village |
| Caroga Lake | 15 | 592 | 410 | 0.85% | 237 | 2.50 | CDP |
| Bleecker town | 16 | 553 | 544 | 0.55% | 10 | 57.13 | Town |
| Stratford town | 17 | 528 | 538 | -0.19% | 7 | 74.88 | Town |
Gloversville is the largest city in Fulton County, with a population of 14,688.
Stratford town is the smallest city in Fulton County.
There are 17 cities in Fulton County, New York.