18 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 4915 | Belfast | 9,030 |
| 4849 | Lincolnville | 3,898 |
| 4496 | Winterport | 3,839 |
| 4974 | Searsport | 2,649 |
| 4981 | Stockton Springs | 2,584 |
| 4986 | Thorndike | 2,323 |
| 4988 | Unity | 1,958 |
| 4952 | Morrill | 1,853 |
| 4921 | Brooks | 1,716 |
| 4941 | Freedom | 1,524 |
| 4973 | Searsmont | 1,494 |
| 4354 | Palermo | 1,420 |
| 4438 | Frankfort | 1,229 |
| 4951 | Monroe | 1,034 |
| 4922 | Burnham | 969 |
| 4987 | Troy | 917 |
| 4949 | Liberty | 913 |
| 4848 | Islesboro | 686 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in Waldo County, Maine (US Census).