34 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Augusta | 1 | 19,225 | 18,917 | 0.32% | 349 | 55.14 | City |
| Augusta city | 2 | 19,206 | 18,917 | 0.27% | 348 | 55.14 | City |
| Waterville | 3 | 16,909 | 16,693 | 0.25% | 1,250 | 13.53 | City |
| Waterville city | 4 | 16,875 | 16,693 | 0.15% | 1,247 | 13.53 | City |
| Winslow town | 5 | 8,024 | 7,957 | -0.01% | 218 | 36.82 | Town |
| Oakland town | 6 | 6,413 | 6,240 | 0.44% | 249 | 25.71 | Town |
| Gardiner | 7 | 6,282 | 5,974 | 1% | 401 | 15.68 | City |
| Gardiner city | 8 | 6,271 | 5,974 | 0.9% | 400 | 15.68 | City |
| Winthrop town | 9 | 6,231 | 6,132 | 0.24% | 200 | 31.16 | Town |
| Sidney town | 10 | 4,956 | 4,664 | 1.1% | 117 | 42.25 | Town |
| Vassalboro town | 11 | 4,649 | 4,533 | 0.5% | 105 | 44.25 | Town |
| China town | 12 | 4,648 | 4,412 | 0.87% | 93 | 49.90 | Town |
| Monmouth town | 13 | 4,266 | 4,086 | 0.73% | 125 | 34.01 | Town |
| Litchfield town | 14 | 3,785 | 3,596 | 0.93% | 101 | 37.42 | Town |
| West Gardiner town | 15 | 3,688 | 3,672 | -0.03% | 150 | 24.63 | Town |
| Belgrade town | 16 | 3,646 | 3,250 | 3.29% | 84 | 43.24 | Town |
| Pittston town | 17 | 3,421 | 2,895 | 3.17% | 106 | 32.17 | Town |
| Clinton town | 18 | 3,381 | 3,369 | -0.06% | 77 | 43.87 | Town |
| Farmingdale town | 19 | 3,018 | 2,997 | 0% | 269 | 11.24 | Town |
| Chelsea town | 20 | 2,838 | 2,785 | 0.28% | 145 | 19.54 | Town |
| Benton town | 21 | 2,830 | 2,722 | 0.64% | 100 | 28.41 | Town |
| Windsor town | 22 | 2,748 | 2,639 | 0.7% | 79 | 34.65 | Town |
| Readfield town | 23 | 2,701 | 2,603 | 0.52% | 93 | 29.16 | Town |
| Hallowell | 24 | 2,643 | 2,567 | 0.57% | 451 | 5.86 | City |
| Hallowell city | 25 | 2,637 | 2,567 | 0.46% | 450 | 5.86 | City |
| Manchester town | 26 | 2,486 | 2,456 | 0.04% | 116 | 21.39 | Town |
| Farmingdale | 27 | 2,338 | 2,451 | 1.08% | 984 | 2.38 | CDP |
| Albion town | 28 | 2,111 | 2,015 | 0.67% | 54 | 38.83 | Town |
| Mount Vernon town | 29 | 1,827 | 1,729 | 0.94% | 48 | 37.90 | Town |
| Randolph town | 30 | 1,772 | 1,744 | 0.17% | 830 | 2.13 | Town |
| Fayette town | 31 | 1,283 | 1,166 | 1.83% | 44 | 29.17 | Town |
| Rome town | 32 | 1,187 | 1,149 | 0.51% | 47 | 25.41 | Town |
| Wayne town | 33 | 1,159 | 1,129 | 0.61% | 60 | 19.26 | Town |
| Vienna town | 34 | 612 | 583 | 0.82% | 25 | 24.30 | Town |
Augusta is the largest city in Kennebec County, with a population of 19,225.
Vienna town is the smallest city in Kennebec County.
There are 34 cities in Kennebec County, Maine.