52 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Calais | 1 | 3,154 | 3,083 | 0.45% | 92 | 34 | City |
| Calais | 2 | 3,128 | 3,083 | 0.03% | 91 | 34 | City |
| Machias | 3 | 2,094 | 2,059 | 0.43% | 151 | 14 | Town |
| Milbridge | 4 | 1,379 | 1,363 | -0.29% | 57 | 24 | Town |
| East Machias | 5 | 1,347 | 1,318 | 0.15% | 39 | 35 | Town |
| Baileyville | 6 | 1,313 | 1,317 | -0.3% | 35 | 37 | Town |
| Eastport | 7 | 1,310 | 1,284 | 0.38% | 360 | 4 | City |
| Eastport | 8 | 1,296 | 1,284 | -0.15% | 357 | 4 | City |
| Jonesport | 9 | 1,270 | 1,240 | 0.24% | 45 | 29 | Town |
| Lubec | 10 | 1,243 | 1,232 | -0.08% | 37 | 33 | Town |
| Addison | 11 | 1,213 | 1,148 | 1.25% | 29 | 42 | Town |
| Steuben | 12 | 1,152 | 1,132 | 0% | 27 | 43 | Town |
| Cherryfield | 13 | 1,102 | 1,107 | -0.27% | 25 | 45 | Town |
| Machiasport | 14 | 1,004 | 969 | -0.2% | 47 | 21 | Town |
| Harrington | 15 | 1,003 | 962 | 1.11% | 48 | 21 | Town |
| Perry | 16 | 802 | 804 | -0.25% | 27 | 29 | Town |
| Pembroke | 17 | 786 | 787 | -0.25% | 29 | 27 | Town |
| Passamaquoddy Indian Township Reservation | 18 | 771 | 763 | 0% | 21 | 38 | Township |
| Princeton | 19 | 755 | 748 | -0.13% | 21 | 37 | Town |
| Passamaquoddy Pleasant Point Reservation | 20 | 692 | 691 | -0.29% | 1,225 | 1 | Township |
| Jonesboro | 21 | 642 | 580 | 2.23% | 18 | 37 | Town |
| Milbridge | 22 | 601 | 532 | 7.13% | 328 | 2 | CDP |
| Danforth | 23 | 592 | 524 | 7.05% | 239 | 2 | CDP |
| Danforth | 24 | 585 | 583 | -0.34% | 11 | 54 | Town |
| Robbinston | 25 | 553 | 539 | 0% | 20 | 28 | Town |
| Marshfield | 26 | 526 | 528 | -0.38% | 31 | 17 | Town |
| Cutler | 27 | 523 | 525 | -0.38% | 11 | 47 | Town |
| Alexander | 28 | 522 | 524 | -0.38% | 13 | 40 | Town |
| Columbia Falls | 29 | 486 | 475 | -0.41% | 20 | 25 | Town |
| Whiting | 30 | 481 | 484 | -0.62% | 10 | 47 | Town |
| Beals | 31 | 465 | 447 | 0.87% | 83 | 6 | Town |
| Columbia | 32 | 439 | 434 | 0% | 12 | 36 | Town |
| Charlotte | 33 | 341 | 337 | 0% | 11 | 31 | Town |
| Roque Bluffs | 34 | 322 | 293 | 1.9% | 31 | 10 | Town |
| Dennysville | 35 | 319 | 302 | 0.63% | 21 | 15 | Town |
| Lubec | 36 | 284 | 400 | -1.39% | 546 | 1 | CDP |
| Whitneyville | 37 | 206 | 202 | -0.48% | 14 | 15 | Town |
| Baring | 38 | 205 | 201 | 0.49% | 10 | 21 | Plantation |
| Vanceboro | 39 | 193 | 166 | 7.22% | 269 | 1 | CDP |
| Topsfield | 40 | 182 | 180 | 0% | 4 | 50 | Town |
| Northfield | 41 | 181 | 179 | 0% | 4 | 44 | Town |
| Cooper | 42 | 171 | 170 | 0% | 6 | 31 | Town |
| Meddybemps | 43 | 137 | 136 | 0% | 10 | 13 | Town |
| Grand Lake Stream | 44 | 130 | 129 | 0% | 3 | 44 | Plantation |
| Wesley | 45 | 123 | 122 | 0% | 2 | 50 | Town |
| Vanceboro | 46 | 105 | 104 | 0% | 5 | 20 | Town |
| Crawford | 47 | 96 | 92 | 0% | 3 | 35 | Town |
| Deblois | 48 | 77 | 75 | 0% | 2 | 36 | Town |
| Talmadge | 49 | 69 | 69 | 0% | 2 | 38 | Town |
| Waite | 50 | 66 | 66 | 0% | 2 | 44 | Town |
| Beddington | 51 | 59 | 61 | -1.67% | 2 | 35 | Town |
| Codyville | 52 | 14 | 14 | 0% | 0.00 | 55 | Plantation |
Calais is the largest city in Washington County, with a population of 3,154.
Codyville is the smallest city in Washington County, with a population of 14.
There are 52 cities in Washington County, Maine.