18 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Montague | 1 | 8,378 | 8,568 | -0.39% | 278 | 30.15 | Town |
| Orange | 2 | 7,536 | 7,563 | -0.15% | 215 | 35.06 | Town |
| Deerfield | 3 | 5,198 | 5,092 | 0.21% | 160 | 32.40 | Town |
| Sunderland | 4 | 3,606 | 3,655 | -0.41% | 254 | 14.22 | Town |
| Northfield | 5 | 2,839 | 2,862 | -0.42% | 83 | 34.26 | Town |
| Bernardston | 6 | 2,113 | 2,099 | 0% | 90 | 23.39 | Town |
| Shelburne | 7 | 1,856 | 1,884 | -0.59% | 80 | 23.16 | Town |
| Leverett | 8 | 1,851 | 1,857 | -0.27% | 81 | 22.79 | Town |
| Buckland | 9 | 1,801 | 1,813 | -0.22% | 92 | 19.67 | Town |
| Conway | 10 | 1,760 | 1,767 | -0.06% | 47 | 37.72 | Town |
| Shutesbury | 11 | 1,707 | 1,720 | -0.41% | 64 | 26.51 | Town |
| Ashfield | 12 | 1,684 | 1,687 | -0.18% | 42 | 39.99 | Town |
| Erving | 13 | 1,655 | 1,657 | -0.24% | 120 | 13.79 | Town |
| Colrain | 14 | 1,647 | 1,603 | 0.55% | 38 | 43.08 | Town |
| Whately | 15 | 1,621 | 1,616 | -0.12% | 80 | 20.16 | Town |
| Gill | 16 | 1,540 | 1,550 | -0.39% | 112 | 13.77 | Town |
| Charlemont | 17 | 1,167 | 1,183 | -0.43% | 44 | 26.25 | Town |
| New Salem | 18 | 1,026 | 0 | 0.59% | 23 | 44.76 | Town |
Montague is the largest city in Franklin County, with a population of 8,378.
New Salem is the smallest city in Franklin County.
There are 18 cities in Franklin County, Massachusetts.