23 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Malone | 1 | 13,800 | 12,128 | 6.26% | 136 | 102 | Town |
| Malone | 2 | 5,314 | 5,490 | -0.54% | 1,704 | 3 | Village |
| Harrietstown | 3 | 5,214 | 5,261 | 0.02% | 26 | 197 | Town |
| Tupper Lake | 4 | 5,078 | 5,136 | 0.02% | 43 | 117 | Town |
| Saranac Lake | 5 | 4,805 | 4,958 | -0.52% | 1,651 | 3 | Village |
| Tupper Lake | 6 | 3,274 | 3,375 | -0.52% | 1,566 | 2 | Village |
| Moira | 7 | 2,877 | 2,911 | -0.03% | 64 | 45 | Town |
| Bangor | 8 | 2,180 | 2,229 | -0.46% | 51 | 43 | Town |
| Westville | 9 | 1,776 | 1,761 | 0.11% | 51 | 35 | Town |
| Chateaugay | 10 | 1,739 | 1,741 | 0.17% | 35 | 50 | Town |
| Fort Covington | 11 | 1,529 | 1,534 | 0.2% | 42 | 37 | Town |
| Constable | 12 | 1,504 | 1,480 | 0.4% | 46 | 33 | Town |
| Burke | 13 | 1,415 | 1,426 | -0.14% | 32 | 44 | Town |
| Bellmont | 14 | 1,346 | 1,324 | 0.82% | 8 | 164 | Town |
| Bombay | 15 | 1,259 | 1,251 | 0.24% | 35 | 36 | Town |
| Brighton | 16 | 1,160 | 1,176 | -0.34% | 15 | 78 | Town |
| Dickinson | 17 | 965 | 968 | -0.31% | 22 | 44 | Town |
| Chateaugay | 18 | 744 | 749 | -0.13% | 687 | 1 | Village |
| Brandon | 19 | 622 | 628 | -0.16% | 15 | 41 | Town |
| Brushton | 20 | 433 | 439 | -0.23% | 1,569 | 0 | Village |
| Santa Clara | 21 | 330 | 329 | 0.3% | 2 | 174 | Town |
| Duane | 22 | 180 | 184 | -0.55% | 2 | 75 | Town |
| Burke | 23 | 164 | 167 | 0% | 564 | 0 | Village |
Malone is the largest city in Franklin County, with a population of 13,800.
Burke is the smallest city in Franklin County, with a population of 164.
There are 23 cities in Franklin County, New York.