| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Malone | 1 | 11,214 | 12,138 | -3.97% | 110 | 102 | Town |
| Malone | 2 | 5,278 | 5,489 | -0.7% | 1,692 | 3 | Village |
| Harrietstown | 3 | 5,156 | 5,246 | -0.21% | 26 | 197 | Town |
| Tupper Lake | 4 | 5,048 | 5,138 | -0.16% | 43 | 117 | Town |
| Saranac Lake | 5 | 4,761 | 4,948 | -0.67% | 1,636 | 3 | Village |
| Tupper Lake | 6 | 3,268 | 3,375 | -0.61% | 1,563 | 2 | Village |
| Moira | 7 | 2,862 | 2,916 | -0.31% | 63 | 45 | Town |
| Bangor | 8 | 2,199 | 2,225 | -0.09% | 51 | 43 | Town |
| Westville | 9 | 1,818 | 1,760 | 1.22% | 52 | 35 | Town |
| Chateaugay | 10 | 1,729 | 1,736 | 0.12% | 35 | 50 | Town |
| Fort Covington | 11 | 1,511 | 1,540 | -0.46% | 41 | 37 | Town |
| Constable | 12 | 1,499 | 1,480 | 0.07% | 46 | 33 | Town |
| Burke | 13 | 1,427 | 1,426 | 0.21% | 32 | 44 | Town |
| Bellmont | 14 | 1,336 | 1,324 | 0.6% | 8.0 | 164 | Town |
| Bombay | 15 | 1,253 | 1,252 | 0.08% | 35 | 36 | Town |
| Brighton | 16 | 1,165 | 1,180 | -0.17% | 15 | 78 | Town |
| Dickinson | 17 | 978 | 968 | 0.31% | 22 | 44 | Town |
| Chateaugay | 18 | 739 | 747 | -0.27% | 682 | 1 | Village |
| Brandon | 19 | 625 | 632 | -0.16% | 15 | 41 | Town |
| Brushton | 20 | 427 | 438 | -0.47% | 1,547 | 0 | Village |
| Santa Clara | 21 | 326 | 325 | 0.62% | 2.0 | 174 | Town |
| Duane | 22 | 178 | 183 | -0.56% | 2.0 | 75 | Town |
| Burke | 23 | 163 | 167 | -0.61% | 560 | 0 | Village |
Malone is the largest city in Franklin County, with a population of 11,214.
Burke is the smallest city in Franklin County, with a population of 163.
There are 23 cities in Franklin County, New York.