31 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 04654 | Machias | 3,363 |
| 04619 | Calais | 3,087 |
| 04694 | Baileyville | 2,263 |
| 04668 | Princeton | 1,934 |
| 04652 | Lubec | 1,489 |
| 04667 | Perry | 1,307 |
| 04630 | East Machias | 1,294 |
| 04649 | Jonesport | 1,276 |
| 04658 | Milbridge | 1,261 |
| 04666 | Pembroke | 1,253 |
| 04680 | Steuben | 1,233 |
| 04631 | Eastport | 1,230 |
| 04623 | Columbia Falls | 1,125 |
| 04606 | Addison | 1,077 |
| 04424 | Danforth | 1,065 |
| 04622 | Cherryfield | 1,043 |
| 04655 | Machiasport | 1,001 |
| 04643 | Harrington | 864 |
| 04671 | Robbinston | 647 |
| 04626 | Cutler | 528 |
| 04691 | Whiting | 527 |
| 04628 | Dennysville | 514 |
| 04648 | Jonesboro | 494 |
| 04611 | Beals | 451 |
| 04657 | Meddybemps | 313 |
| 04490 | Topsfield | 240 |
| 04413 | Brookton | 225 |
| 04492 | Waite | 185 |
| 04686 | Wesley | 166 |
| 04491 | Vanceboro | 158 |
| 04454 | Lambert Lake | 10 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 31 ZCTAs in Washington County, Maine (US Census).