| Zip Code | City | Population ↓ |
|---|---|---|
| 4915 | Belfast | 9,078 |
| 4496 | Winterport | 3,837 |
| 4849 | Lincolnville | 3,808 |
| 4974 | Searsport | 2,649 |
| 4981 | Stockton Springs | 2,479 |
| 4986 | Thorndike | 2,382 |
| 4988 | Unity | 1,988 |
| 4941 | Freedom | 1,736 |
| 4952 | Morrill | 1,730 |
| 4921 | Brooks | 1,586 |
| 4354 | Palermo | 1,447 |
| 4973 | Searsmont | 1,415 |
| 4438 | Frankfort | 1,323 |
| 4951 | Monroe | 1,079 |
| 4987 | Troy | 962 |
| 4949 | Liberty | 884 |
| 4922 | Burnham | 829 |
| 4848 | Islesboro | 617 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in Waldo County, Maine (US Census).