17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Belfast | 1 | 7,143 | 6,944 | 0.52% | 210 | 34.05 | City |
| Winterport | 2 | 3,957 | 3,822 | 0.84% | 111 | 35.53 | Town |
| Searsport | 3 | 2,668 | 2,647 | 0.19% | 93 | 28.65 | Town |
| Lincolnville | 4 | 2,461 | 2,320 | 1.36% | 66 | 37.35 | Town |
| Unity | 5 | 2,353 | 2,287 | 0.21% | 60 | 39.39 | Town |
| Palermo | 6 | 1,668 | 1,572 | 1.21% | 41 | 40.56 | Town |
| Northport | 7 | 1,647 | 1,552 | 1.04% | 69 | 23.77 | Town |
| Stockton Springs | 8 | 1,637 | 1,541 | 1.24% | 83 | 19.64 | Town |
| Searsmont | 9 | 1,485 | 1,406 | 1.23% | 39 | 37.73 | Town |
| Swanville | 10 | 1,459 | 1,380 | 1.25% | 74 | 19.73 | Town |
| Frankfort | 11 | 1,277 | 1,232 | 0.95% | 52 | 24.61 | Town |
| Troy | 12 | 1,148 | 1,024 | 2.59% | 33 | 34.92 | Town |
| Burnham | 13 | 1,137 | 1,101 | 0.8% | 29 | 38.89 | Town |
| Belmont | 14 | 1,059 | 0 | 1.63% | 78 | 13.61 | Town |
| Montville | 15 | 1,047 | 1,019 | 0.67% | 25 | 42.66 | Town |
| Brooks | 16 | 1,044 | 1,009 | 0.87% | 42 | 24.67 | Town |
| Morrill | 17 | 1,030 | 0 | 1.28% | 62 | 16.56 | Town |
Belfast is the largest city in Waldo County, with a population of 7,143.
Morrill is the smallest city in Waldo County.
There are 17 cities in Waldo County, Maine.