52 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Calais | 1 | 3,154 | 3,083 | 0.45% | 92 | 34.32 | City |
| Calais city | 2 | 3,128 | 3,083 | 0.03% | 91 | 34.32 | City |
| Machias town | 3 | 2,094 | 2,059 | 0.43% | 151 | 13.89 | Town |
| Milbridge town | 4 | 1,379 | 1,363 | -0.29% | 57 | 24.25 | Town |
| East Machias town | 5 | 1,347 | 1,318 | 0.15% | 39 | 34.93 | Town |
| Baileyville town | 6 | 1,313 | 1,317 | -0.3% | 35 | 37.25 | Town |
| Eastport | 7 | 1,310 | 1,284 | 0.38% | 360 | 3.63 | City |
| Eastport city | 8 | 1,296 | 1,284 | -0.15% | 357 | 3.63 | City |
| Jonesport town | 9 | 1,270 | 1,240 | 0.24% | 45 | 28.51 | Town |
| Lubec town | 10 | 1,243 | 1,232 | -0.08% | 37 | 33.24 | Town |
| Addison town | 11 | 1,213 | 1,148 | 1.25% | 29 | 42.45 | Town |
| Steuben town | 12 | 1,152 | 1,132 | 0% | 27 | 43.01 | Town |
| Cherryfield town | 13 | 1,102 | 1,107 | -0.27% | 25 | 44.53 | Town |
| Machiasport town | 14 | 1,004 | 969 | -0.2% | 47 | 21.40 | Town |
| Harrington town | 15 | 1,003 | 962 | 1.11% | 48 | 21.11 | Town |
| Perry town | 16 | 802 | 804 | -0.25% | 27 | 29.30 | Town |
| Pembroke town | 17 | 786 | 787 | -0.25% | 29 | 27.36 | Town |
| Passamaquoddy Indian Township Reservation | 18 | 771 | 763 | 0% | 21 | 37.54 | Township |
| Princeton town | 19 | 755 | 748 | -0.13% | 21 | 36.62 | Town |
| Passamaquoddy Pleasant Point Reservation | 20 | 692 | 691 | -0.29% | 1,225 | 0.56 | Township |
| Jonesboro town | 21 | 642 | 580 | 2.23% | 18 | 36.58 | Town |
| Milbridge | 22 | 601 | 532 | 7.13% | 328 | 1.83 | CDP |
| Danforth | 23 | 592 | 524 | 7.05% | 239 | 2.48 | CDP |
| Danforth town | 24 | 585 | 583 | -0.34% | 11 | 54 | Town |
| Robbinston town | 25 | 553 | 539 | 0% | 20 | 28.19 | Town |
| Marshfield town | 26 | 526 | 528 | -0.38% | 31 | 17.01 | Town |
| Cutler town | 27 | 523 | 525 | -0.38% | 11 | 46.83 | Town |
| Alexander town | 28 | 522 | 524 | -0.38% | 13 | 40.14 | Town |
| Columbia Falls town | 29 | 486 | 475 | -0.41% | 20 | 24.54 | Town |
| Whiting town | 30 | 481 | 484 | -0.62% | 10 | 46.72 | Town |
| Beals town | 31 | 465 | 447 | 0.87% | 83 | 5.62 | Town |
| Columbia town | 32 | 439 | 434 | 0% | 12 | 36.30 | Town |
| Charlotte town | 33 | 341 | 337 | 0% | 11 | 30.99 | Town |
| Roque Bluffs town | 34 | 322 | 293 | 1.9% | 31 | 10.39 | Town |
| Dennysville town | 35 | 319 | 302 | 0.63% | 21 | 14.92 | Town |
| Lubec | 36 | 284 | 400 | -1.39% | 546 | 0.52 | CDP |
| Whitneyville town | 37 | 206 | 202 | -0.48% | 14 | 14.88 | Town |
| Baring plantation | 38 | 205 | 201 | 0.49% | 10 | 20.84 | Plantation |
| Vanceboro | 39 | 193 | 166 | 7.22% | 269 | 0.72 | CDP |
| Topsfield town | 40 | 182 | 180 | 0% | 4 | 50.09 | Town |
| Northfield town | 41 | 181 | 179 | 0% | 4 | 43.58 | Town |
| Cooper town | 42 | 171 | 170 | 0% | 6 | 30.70 | Town |
| Meddybemps town | 43 | 137 | 136 | 0% | 10 | 13.11 | Town |
| Grand Lake Stream plantation | 44 | 130 | 129 | 0% | 3 | 43.97 | Plantation |
| Wesley town | 45 | 123 | 122 | 0% | 2 | 49.88 | Town |
| Vanceboro town | 46 | 105 | 104 | 0% | 5 | 20.14 | Town |
| Crawford town | 47 | 96 | 92 | 0% | 3 | 34.52 | Town |
| Deblois town | 48 | 77 | 75 | 0% | 2 | 35.84 | Town |
| Talmadge town | 49 | 69 | 69 | 0% | 2 | 37.80 | Town |
| Waite town | 50 | 66 | 66 | 0% | 2 | 43.98 | Town |
| Beddington town | 51 | 59 | 61 | -1.67% | 2 | 34.57 | Town |
| Codyville plantation | 52 | 14 | 14 | 0% | 0.00 | 54.67 | Plantation |
Calais is the largest city in Washington County, with a population of 3,154.
Codyville plantation is the smallest city in Washington County.
There are 52 cities in Washington County, Maine.