36 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Skowhegan | 1 | 8,668 | 8,613 | -0.06% | 147 | 59 | Town |
| Fairfield | 2 | 6,540 | 6,490 | 0% | 122 | 54 | Town |
| Madison | 3 | 4,858 | 4,725 | 0.45% | 94 | 52 | Town |
| Pittsfield | 4 | 3,921 | 3,907 | -0.13% | 81 | 48 | Town |
| Norridgewock | 5 | 3,328 | 3,277 | 0.18% | 67 | 50 | Town |
| Anson | 6 | 2,327 | 2,290 | 0.22% | 49 | 47 | Town |
| Canaan | 7 | 2,208 | 2,191 | 0% | 54 | 41 | Town |
| St. Albans | 8 | 2,169 | 2,051 | 1.07% | 48 | 45 | Town |
| Palmyra | 9 | 2,057 | 1,926 | 1.33% | 51 | 40 | Town |
| Hartland | 10 | 1,981 | 1,699 | 2.7% | 53 | 37 | Town |
| Cornville | 11 | 1,373 | 1,314 | 0.81% | 34 | 41 | Town |
| Solon | 12 | 1,012 | 971 | 0.8% | 26 | 40 | Town |
| Embden | 13 | 970 | 904 | 1.36% | 25 | 40 | Town |
| Athens | 14 | 958 | 949 | 0% | 22 | 44 | Town |
| Detroit | 15 | 950 | 880 | 1.71% | 47 | 20 | Town |
| Smithfield | 16 | 938 | 926 | -0.21% | 47 | 20 | Town |
| Bingham | 17 | 833 | 868 | -0.24% | 25 | 34 | Town |
| Harmony | 18 | 827 | 827 | -0.12% | 21 | 39 | Town |
| Jackman | 19 | 782 | 778 | -0.13% | 19 | 41 | Town |
| New Portland | 20 | 765 | 764 | -0.13% | 17 | 44 | Town |
| Mercer | 21 | 714 | 710 | 0% | 27 | 27 | Town |
| Starks | 22 | 640 | 597 | 1.91% | 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 |
| Ripley | 26 | 482 | 484 | -0.21% | 20 | 25 | Town |
| Moscow | 27 | 479 | 474 | 0% | 10 | 46 | Town |
| Cambridge | 28 | 468 | 448 | 1.08% | 24 | 19 | Town |
| Moose River | 29 | 186 | 187 | -0.53% | 5 | 40 | Town |
| Pleasant Ridge | 30 | 86 | 86 | 0% | 4 | 22 | Plantation |
| Caratunk | 31 | 83 | 79 | 1.22% | 2 | 52 | Town |
| West Forks | 32 | 64 | 61 | 1.59% | 1 | 49 | Plantation |
| Brighton | 33 | 61 | 61 | 0% | 2 | 39 | Plantation |
| Dennistown | 34 | 57 | 57 | 0% | 1 | 39 | Plantation |
| Highland | 35 | 53 | 53 | 0% | 1 | 42 | Plantation |
| The Forks | 36 | 49 | 49 | 0% | 1 | 40 | Plantation |
Skowhegan is the largest city in Somerset County, with a population of 8,668.
The Forks is the smallest city in Somerset County, with a population of 49.
There are 36 cities in Somerset County, Maine.