| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Skowhegan | 1 | 8,661 | 8,616 | -0.17% | 147 | 59 | Town |
| Fairfield | 2 | 6,534 | 6,488 | -0.05% | 122 | 54 | Town |
| Madison | 3 | 4,931 | 4,727 | 0.88% | 95 | 52 | Town |
| Pittsfield | 4 | 3,928 | 3,906 | -0.18% | 82 | 48 | Town |
| Norridgewock | 5 | 3,302 | 3,275 | -0.06% | 66 | 50 | Town |
| Anson | 6 | 2,335 | 2,290 | 0.09% | 49 | 47 | Town |
| Canaan | 7 | 2,220 | 2,190 | 0.05% | 54 | 41 | Town |
| St. Albans | 8 | 2,197 | 2,053 | 0.97% | 49 | 45 | Town |
| Palmyra | 9 | 2,119 | 1,926 | 2.02% | 53 | 40 | Town |
| Hartland | 10 | 1,927 | 1,699 | 1.96% | 52 | 37 | Town |
| Cornville | 11 | 1,387 | 1,312 | 0.65% | 34 | 41 | Town |
| Solon | 12 | 1,008 | 971 | 0% | 25 | 40 | Town |
| Embden | 13 | 962 | 903 | 0.42% | 24 | 40 | Town |
| Smithfield | 14 | 956 | 927 | 0.31% | 48 | 20 | Town |
| Athens | 15 | 946 | 955 | -0.94% | 22 | 44 | Town |
| Detroit | 16 | 933 | 881 | 0.43% | 46 | 20 | Town |
| Bingham | 17 | 832 | 865 | -0.12% | 25 | 34 | Town |
| Harmony | 18 | 827 | 827 | -0.24% | 21 | 39 | Town |
| Jackman | 19 | 798 | 794 | -0.13% | 19 | 41 | Town |
| New Portland | 20 | 766 | 764 | 0% | 17 | 44 | Town |
| Mercer | 21 | 712 | 710 | -0.14% | 27 | 27 | Town |
| Starks | 22 | 638 | 598 | 0.95% | 20 | 31 | Town |
| Moscow | 23 | 492 | 473 | 0% | 11 | 46 | Town |
| Ripley | 24 | 488 | 484 | 0.21% | 20 | 25 | Town |
| Cambridge | 25 | 465 | 444 | 1.09% | 24 | 19 | Town |
| Moose River | 26 | 185 | 186 | -0.54% | 5.0 | 40 | Town |
| Pleasant Ridge | 27 | 85 | 86 | -1.16% | 4.0 | 22 | Plantation |
| Caratunk | 28 | 81 | 79 | -1.22% | 2.0 | 52 | Town |
| Brighton | 29 | 60 | 62 | -1.64% | 2.0 | 39 | Plantation |
| Dennistown | 30 | 60 | 60 | 0% | 2.0 | 39 | Plantation |
| West Forks | 31 | 58 | 58 | 0% | 1.0 | 49 | Plantation |
| Highland | 32 | 54 | 53 | 0% | 1.0 | 42 | Plantation |
| The Forks | 33 | 48 | 48 | 0% | 1.0 | 40 | Plantation |
Skowhegan is the largest city in Somerset County, with a population of 8,661.
The Forks is the smallest city in Somerset County, with a population of 48.
There are 33 cities in Somerset County, Maine.