18 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 04915 | Belfast | 9,107 |
| 04849 | Lincolnville | 4,017 |
| 04496 | Winterport | 3,850 |
| 04974 | Searsport | 2,655 |
| 04981 | Stockton Springs | 2,575 |
| 04986 | Thorndike | 2,228 |
| 04988 | Unity | 1,894 |
| 04952 | Morrill | 1,790 |
| 04921 | Brooks | 1,775 |
| 04973 | Searsmont | 1,646 |
| 04941 | Freedom | 1,577 |
| 04354 | Palermo | 1,473 |
| 04438 | Frankfort | 1,098 |
| 04951 | Monroe | 1,001 |
| 04987 | Troy | 984 |
| 04949 | Liberty | 969 |
| 04922 | Burnham | 953 |
| 04848 | Islesboro | 636 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 18 ZCTAs in Waldo County, Maine (US Census).