31 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 04654 | Machias | 3,340 |
| 04619 | Calais | 3,097 |
| 04694 | Baileyville | 2,155 |
| 04668 | Princeton | 2,010 |
| 04652 | Lubec | 1,525 |
| 04680 | Steuben | 1,388 |
| 04667 | Perry | 1,296 |
| 04631 | Eastport | 1,263 |
| 04630 | East Machias | 1,230 |
| 04658 | Milbridge | 1,222 |
| 04666 | Pembroke | 1,178 |
| 04623 | Columbia Falls | 1,173 |
| 04649 | Jonesport | 1,166 |
| 04622 | Cherryfield | 1,050 |
| 04606 | Addison | 1,045 |
| 04655 | Machiasport | 1,016 |
| 04424 | Danforth | 983 |
| 04643 | Harrington | 917 |
| 04671 | Robbinston | 621 |
| 04628 | Dennysville | 582 |
| 04648 | Jonesboro | 570 |
| 04691 | Whiting | 499 |
| 04611 | Beals | 498 |
| 04626 | Cutler | 492 |
| 04686 | Wesley | 328 |
| 04657 | Meddybemps | 326 |
| 04490 | Topsfield | 228 |
| 04492 | Waite | 175 |
| 04413 | Brookton | 162 |
| 04491 | Vanceboro | 122 |
| 04454 | Lambert Lake | 11 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 31 ZCTAs in Washington County, Maine (US Census).