36 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Skowhegan | 1 | 8,672 | 8,618 | 0.09% | 147 | 59 | Town |
| Fairfield | 2 | 6,534 | 6,491 | 0.06% | 122 | 54 | Town |
| Madison | 3 | 4,876 | 4,725 | 0.76% | 94 | 52 | Town |
| Pittsfield | 4 | 3,953 | 3,908 | 0.23% | 82 | 48 | Town |
| Norridgewock | 5 | 3,303 | 3,276 | 0.12% | 66 | 50 | Town |
| Anson | 6 | 2,324 | 2,290 | 0.17% | 49 | 47 | Town |
| Canaan | 7 | 2,204 | 2,190 | 0.14% | 54 | 41 | Town |
| St. Albans | 8 | 2,161 | 2,049 | 1.12% | 48 | 45 | Town |
| Palmyra | 9 | 2,059 | 1,926 | 1.28% | 51 | 40 | Town |
| Hartland | 10 | 1,816 | 1,699 | -1.57% | 49 | 37 | Town |
| Cornville | 11 | 1,377 | 1,314 | 1.03% | 34 | 41 | Town |
| Solon | 12 | 1,019 | 971 | 1.39% | 26 | 40 | Town |
| Athens | 13 | 965 | 953 | 0.42% | 22 | 44 | Town |
| Embden | 14 | 962 | 904 | 1.05% | 24 | 40 | Town |
| Smithfield | 15 | 949 | 924 | 0.53% | 48 | 20 | Town |
| Detroit | 16 | 929 | 881 | 0.87% | 46 | 20 | Town |
| Bingham | 17 | 832 | 868 | -0.12% | 25 | 34 | Town |
| Harmony | 18 | 826 | 827 | -0.12% | 21 | 39 | Town |
| Jackman | 19 | 779 | 778 | -0.26% | 19 | 41 | Town |
| New Portland | 20 | 763 | 762 | 0% | 17 | 44 | Town |
| Mercer | 21 | 712 | 710 | 0% | 27 | 27 | Town |
| Starks | 22 | 627 | 597 | 1.13% | 20 | 31 | Town |
| Bingham | 23 | 592 | 766 | -1.82% | 262 | 2 | CDP |
| North Anson | 24 | 578 | 471 | 7.24% | 274 | 2 | CDP |
| Hartland | 25 | 550 | 531 | -3.17% | 247 | 2 | CDP |
| Moscow | 26 | 501 | 475 | 2.04% | 11 | 46 | Town |
| Ripley | 27 | 488 | 484 | 0.62% | 20 | 25 | Town |
| Cambridge | 28 | 459 | 446 | 0.66% | 24 | 19 | Town |
| Moose River | 29 | 186 | 186 | 0% | 5 | 40 | Town |
| Pleasant Ridge | 30 | 88 | 88 | 0% | 4 | 22 | Plantation |
| Caratunk | 31 | 84 | 80 | 1.2% | 2 | 52 | Town |
| Dennistown | 32 | 65 | 61 | 3.17% | 2 | 39 | Plantation |
| Brighton | 33 | 62 | 62 | 0% | 2 | 39 | Plantation |
| West Forks | 34 | 62 | 62 | 0% | 1 | 49 | Plantation |
| Highland | 35 | 53 | 53 | 0% | 1 | 42 | Plantation |
| The Forks | 36 | 48 | 48 | 0% | 1 | 40 | Plantation |
Skowhegan is the largest city in Somerset County, with a population of 8,672.
The Forks is the smallest city in Somerset County, with a population of 48.
There are 36 cities in Somerset County, Maine.