17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gloversville | 1 | 14,845 | 15,089 | -0.33% | 2,942 | 5 | City |
| Johnstown | 2 | 7,989 | 8,176 | -0.47% | 1,657 | 5 | City |
| Johnstown | 3 | 6,281 | 6,790 | -0.46% | 89 | 70 | Town |
| Mayfield | 4 | 6,029 | 6,133 | -0.58% | 103 | 58 | Town |
| Broadalbin | 5 | 5,056 | 5,130 | -0.32% | 159 | 32 | Town |
| Perth | 6 | 3,491 | 3,575 | -0.77% | 134 | 26 | Town |
| Northampton | 7 | 2,471 | 2,476 | -0.24% | 117 | 21 | Town |
| Northville | 8 | 1,951 | 1,607 | 2.15% | 264 | 7 | CDP |
| Oppenheim | 9 | 1,746 | 1,746 | -0.11% | 31 | 56 | Town |
| Ephratah | 10 | 1,639 | 1,672 | -0.73% | 42 | 39 | Town |
| Broadalbin | 11 | 1,327 | 1,362 | -0.52% | 982 | 1 | Village |
| Caroga | 12 | 1,239 | 1,245 | -0.16% | 24 | 51 | Town |
| Northville | 13 | 990 | 1,009 | -0.4% | 931 | 1 | Village |
| Mayfield | 14 | 774 | 792 | -0.51% | 769 | 1 | Village |
| Caroga Lake | 15 | 592 | 410 | 0.85% | 237 | 3 | CDP |
| Bleecker | 16 | 547 | 544 | 0% | 10 | 57 | Town |
| Stratford | 17 | 520 | 535 | -0.76% | 7 | 75 | Town |
Gloversville is the largest city in Fulton County, with a population of 14,845.
Stratford is the smallest city in Fulton County, with a population of 520.
There are 17 cities in Fulton County, New York.