| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Farmington | 1 | 8,211 | 7,587 | -0.57% | 147 | 56 | Town |
| Jay | 2 | 4,612 | 4,619 | -0.58% | 95 | 48 | Town |
| Wilton | 3 | 3,865 | 3,828 | -0.34% | 94 | 41 | Town |
| New Sharon | 4 | 1,637 | 1,471 | 1.43% | 35 | 46 | Town |
| Chesterville | 5 | 1,382 | 1,328 | 0.29% | 38 | 36 | Town |
| Rangeley | 6 | 1,353 | 1,223 | 1.27% | 33 | 41 | Town |
| Strong | 7 | 1,113 | 1,120 | -0.8% | 39 | 28 | Town |
| Kingfield | 8 | 1,037 | 965 | 1.17% | 24 | 43 | Town |
| Phillips | 9 | 946 | 897 | 0.42% | 19 | 51 | Town |
| Industry | 10 | 813 | 785 | 0.49% | 27 | 30 | Town |
| New Vineyard | 11 | 756 | 723 | -0.4% | 21 | 36 | Town |
| Carrabassett Valley | 12 | 713 | 674 | 0.28% | 9.0 | 77 | Town |
| Eustis | 13 | 671 | 641 | -0.15% | 17 | 39 | Town |
| Temple | 14 | 548 | 528 | -0.18% | 15 | 36 | Town |
| Carthage | 15 | 506 | 504 | -0.59% | 15 | 33 | Town |
| Avon | 16 | 448 | 450 | -0.67% | 11 | 41 | Town |
| Weld | 17 | 431 | 378 | 0.7% | 7.0 | 59 | Town |
| Dallas | 18 | 311 | 313 | -0.64% | 8.0 | 39 | Plantation |
| Rangeley | 19 | 178 | 179 | -0.56% | 4.0 | 41 | Plantation |
| Coplin | 20 | 131 | 132 | -0.76% | 4.0 | 33 | Plantation |
| Sandy River | 21 | 125 | 126 | -0.79% | 4.0 | 34 | Plantation |
Farmington is the largest city in Franklin County, with a population of 8,211.
Sandy River is the smallest city in Franklin County, with a population of 125.
There are 21 cities in Franklin County, Maine.