15 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gloversville | 1 | 14,796 | 15,089 | -0.33% | 2,932 | 5 | City |
| Johnstown | 2 | 7,952 | 8,176 | -0.46% | 1,650 | 5 | City |
| Johnstown | 3 | 6,252 | 6,790 | -0.46% | 89 | 70 | Town |
| Mayfield | 4 | 5,994 | 6,133 | -0.58% | 103 | 58 | Town |
| Broadalbin | 5 | 5,040 | 5,130 | -0.32% | 159 | 32 | Town |
| Perth | 6 | 3,464 | 3,575 | -0.77% | 133 | 26 | Town |
| Northampton | 7 | 2,465 | 2,476 | -0.24% | 117 | 21 | Town |
| Oppenheim | 8 | 1,744 | 1,746 | -0.11% | 31 | 56 | Town |
| Ephratah | 9 | 1,627 | 1,672 | -0.73% | 42 | 39 | Town |
| Broadalbin | 10 | 1,320 | 1,362 | -0.53% | 976 | 1 | Village |
| Caroga | 11 | 1,237 | 1,245 | -0.16% | 24 | 51 | Town |
| Northville | 12 | 986 | 1,009 | -0.4% | 928 | 1 | Village |
| Mayfield | 13 | 771 | 792 | -0.39% | 766 | 1 | Village |
| Bleecker | 14 | 547 | 544 | 0% | 10 | 57 | Town |
| Stratford | 15 | 516 | 535 | -0.77% | 7 | 75 | Town |
Gloversville is the largest city in Fulton County, with a population of 14,796.
Stratford is the smallest city in Fulton County, with a population of 516.
There are 15 cities in Fulton County, New York.