28 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Belfast | 1 | 7,152 | 6,944 | 0.59% | 210 | 34.05 | City |
| Belfast city | 2 | 7,143 | 6,944 | 0.52% | 210 | 34.05 | City |
| Winterport town | 3 | 3,957 | 3,822 | 0.84% | 111 | 35.53 | Town |
| Searsport town | 4 | 2,668 | 2,647 | 0.19% | 93 | 28.65 | Town |
| Lincolnville town | 5 | 2,461 | 2,320 | 1.36% | 66 | 37.35 | Town |
| Unity town | 6 | 2,353 | 2,287 | 0.21% | 60 | 39.39 | Town |
| Palermo town | 7 | 1,668 | 1,572 | 1.21% | 41 | 40.56 | Town |
| Northport town | 8 | 1,647 | 1,552 | 1.04% | 69 | 23.77 | Town |
| Stockton Springs town | 9 | 1,637 | 1,541 | 1.24% | 83 | 19.64 | Town |
| Searsmont town | 10 | 1,485 | 1,406 | 1.23% | 39 | 37.73 | Town |
| Swanville town | 11 | 1,459 | 1,380 | 1.25% | 74 | 19.73 | Town |
| Frankfort town | 12 | 1,277 | 1,232 | 0.95% | 52 | 24.61 | Town |
| Troy town | 13 | 1,148 | 1,024 | 2.59% | 33 | 34.92 | Town |
| Burnham town | 14 | 1,137 | 1,101 | 0.8% | 29 | 38.89 | Town |
| Belmont town | 15 | 1,059 | 979 | 1.63% | 78 | 13.61 | Town |
| Montville town | 16 | 1,047 | 1,019 | 0.67% | 25 | 42.66 | Town |
| Brooks town | 17 | 1,044 | 1,009 | 0.87% | 42 | 24.67 | Town |
| Morrill town | 18 | 1,030 | 970 | 1.28% | 62 | 16.56 | Town |
| Liberty town | 19 | 968 | 937 | 0.83% | 37 | 26 | Town |
| Monroe town | 20 | 959 | 931 | 0.74% | 25 | 38.91 | Town |
| Waldo town | 21 | 877 | 797 | 2.1% | 45 | 19.29 | Town |
| Knox town | 22 | 822 | 810 | 0.37% | 28 | 29 | Town |
| Thorndike town | 23 | 817 | 777 | 1.11% | 32 | 25.25 | Town |
| Freedom town | 24 | 728 | 714 | 0.14% | 34 | 21.52 | Town |
| Prospect town | 25 | 727 | 697 | 0.97% | 40 | 18.09 | Town |
| Jackson town | 26 | 630 | 610 | 0.8% | 25 | 25.26 | Town |
| Islesboro town | 27 | 602 | 580 | 0.84% | 42 | 14.31 | Town |
| Unity | 28 | 247 | 274 | -5.36% | 135 | 1.83 | CDP |
Belfast is the largest city in Waldo County, with a population of 7,152.
Unity is the smallest city in Waldo County.
There are 28 cities in Waldo County, Maine.