23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Malone | 1 | 12,987 | 12,128 | 6.68% | 128 | 102 | Town |
| Malone | 2 | 5,343 | 5,490 | -0.56% | 1,713 | 3 | Village |
| Harrietstown | 3 | 5,213 | 5,261 | 0.02% | 26 | 197 | Town |
| Tupper Lake | 4 | 5,077 | 5,136 | 0.02% | 43 | 117 | Town |
| Saranac Lake | 5 | 4,830 | 4,958 | -0.54% | 1,659 | 3 | Village |
| Tupper Lake | 6 | 3,291 | 3,375 | -0.51% | 1,574 | 2 | Village |
| Moira | 7 | 2,878 | 2,911 | -0.03% | 64 | 45 | Town |
| Bangor | 8 | 2,190 | 2,229 | -0.45% | 51 | 43 | Town |
| Westville | 9 | 1,774 | 1,761 | 0.11% | 51 | 35 | Town |
| Chateaugay | 10 | 1,736 | 1,741 | 0.17% | 35 | 50 | Town |
| Fort Covington | 11 | 1,526 | 1,534 | 0.2% | 42 | 37 | Town |
| Constable | 12 | 1,498 | 1,480 | 0.4% | 46 | 33 | Town |
| Burke | 13 | 1,417 | 1,426 | -0.14% | 32 | 44 | Town |
| Bellmont | 14 | 1,335 | 1,324 | 0.83% | 8 | 164 | Town |
| Bombay | 15 | 1,256 | 1,251 | 0.24% | 35 | 36 | Town |
| Brighton | 16 | 1,164 | 1,176 | -0.34% | 15 | 78 | Town |
| Dickinson | 17 | 968 | 968 | -0.31% | 22 | 44 | Town |
| Chateaugay | 18 | 745 | 749 | -0.13% | 688 | 1 | Village |
| Brandon | 19 | 623 | 628 | -0.16% | 15 | 41 | Town |
| Brushton | 20 | 434 | 439 | -0.23% | 1,572 | 0 | Village |
| Santa Clara | 21 | 329 | 329 | 0.3% | 2 | 174 | Town |
| Duane | 22 | 181 | 184 | -0.55% | 2 | 75 | Town |
| Burke | 23 | 164 | 167 | -0.61% | 564 | 0 | Village |
Malone is the largest city in Franklin County, with a population of 12,987.
Burke is the smallest city in Franklin County, with a population of 164.
There are 23 cities in Franklin County, New York.