County ZIP codes · Maine · FIPS 23029
Washington County, ME ZIP Codes
Washington County, Maine has 32 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 31 residential and 1 for PO boxes or a single organization. 2 of the residential ones extend into a neighboring county. Median household income ranges from $45,573 in 04631 (Eastport) to $76,466 in 04680 (Steuben) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Washington County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $50,163 and $64,096.
They carry 31 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 31 residential ZIP codes in Washington County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 04654 | Machias | 3,340 | 28 | $49k | $172k | 100% |
| 04619 | Calais | 3,097 | 90 | $64k | $111k | 100% |
| 04694 | Baileyville | 2,155 | 16 | $65k | $130k | 100% |
| 04668 | Princeton | 2,010 | 9 | $49k | $118k | 100% |
| 04652 | Lubec | 1,525 | 25 | $52k | $188k | 100% |
| 04680 | Steuben | 1,388 | 32 | $77k | $174k | 100% |
| 04667 | Perry | 1,296 | 43 | $75k | $169k | 100% |
| 04631 | Eastport | 1,263 | 347 | $46k | $180k | 100% |
| 04630 | East Machias | 1,230 | 14 | $58k | $211k | 100% |
| 04658 | Milbridge | 1,222 | 51 | $61k | $240k | 100% |
| 04666 | Pembroke | 1,178 | 20 | $61k | $142k | 100% |
| 04623 | Columbia Falls | 1,173 | 10 | $50k | $181k | 100% |
| 04649 | Jonesport | 1,166 | 41 | $68k | $142k | 100% |
| 04622 | Cherryfield | 1,050 | 3 | $44k | $166k | 77% |
| 04606 | Addison | 1,045 | 25 | $51k | $164k | 100% |
| 04655 | Machiasport | 1,016 | 47 | $60k | $177k | 100% |
| 04424 | Danforth | 983 | 10 | $49k | $112k | 54% |
| 04643 | Harrington | 917 | 43 | $65k | $145k | 100% |
| 04671 | Robbinston | 621 | 22 | $68k | $228k | 100% |
| 04628 | Dennysville | 582 | 6 | $52k | $178k | 100% |
| 04648 | Jonesboro | 570 | 19 | $64k | $151k | 100% |
| 04691 | Whiting | 499 | 11 | $55k | $213k | 100% |
| 04611 | Beals | 498 | 89 | $64k | $257k | 100% |
| 04626 | Cutler | 492 | 11 | $73k | $156k | 100% |
| 04686 | Wesley | 328 | 3 | $52k | $70k | 100% |
| 04657 | Meddybemps | 326 | 4 | $49k | $221k | 100% |
| 04490 | Topsfield | 228 | 1 | $46k | $130k | 100% |
| 04492 | Waite | 175 | 4 | $63k | $78k | 100% |
| 04413 | Brookton | 162 | 1 | $55k | $183k | 100% |
| 04491 | Vanceboro | 122 | 4 | – | $114k | 100% |
| 04454 | Lambert Lake | 11 | 1 | – | – | 100% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
2 ZIP codes of Washington County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Washington | Elsewhere |
|---|---|---|
| 04622 | 77% | Hancock County 23% |
| 04424 | 54% | Aroostook County 46% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 04637 | Grand Lake Stream |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Washington County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Washington County's ZIP codes use 2 prefixes: 044 and 046.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.