56 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hagerstown | 1 | 44,006 | 43,546 | 0.22% | 3,456 | 13 | City |
| Hagerstown | 2 | 44,006 | 43,518 | 0.22% | 3,456 | 13 | City |
| Halfway | 3 | 10,101 | 10,804 | -0.39% | 2,313 | 4 | CDP |
| Robinwood | 4 | 8,273 | 7,482 | 1.1% | 2,174 | 4 | CDP |
| Fountainhead-Orchard Hills | 5 | 6,331 | 5,964 | 0.7% | 1,434 | 4 | CDP |
| St. James | 6 | 4,394 | 3,567 | 2.23% | 727 | 6 | CDP |
| Boonsboro | 7 | 3,868 | 3,797 | 0.47% | 1,267 | 3 | Town |
| Boonsboro | 8 | 3,868 | 3,778 | 0.47% | 1,267 | 3 | Town |
| Smithsburg | 9 | 3,243 | 2,996 | 1.53% | 2,793 | 1 | Town |
| Smithsburg | 10 | 3,243 | 2,995 | 1.53% | 2,793 | 1 | Town |
| Paramount-Long Meadow | 11 | 2,851 | 2,834 | 0.67% | 1,307 | 2 | CDP |
| Maugansville | 12 | 2,695 | 2,148 | -0.92% | 1,101 | 2 | CDP |
| Williamsport | 13 | 2,108 | 2,085 | 0.29% | 2,144 | 1 | Town |
| Williamsport | 14 | 2,108 | 2,078 | 0.29% | 2,144 | 1 | Town |
| Hancock | 15 | 1,574 | 1,554 | 0.25% | 529 | 3 | Town |
| Hancock | 16 | 1,574 | 1,552 | 0.25% | 529 | 3 | Town |
| Wilson-Conococheague | 17 | 1,547 | 2,014 | -3.07% | 328 | 5 | CDP |
| Keedysville | 18 | 1,233 | 1,212 | 0.33% | 1,457 | 1 | Town |
| Keedysville | 19 | 1,233 | 1,212 | 0.33% | 1,457 | 1 | Town |
| Downsville | 20 | 1,059 | 863 | 4.64% | 1,694 | 1 | CDP |
| Funkstown | 21 | 860 | 849 | 0.23% | 1,541 | 1 | Town |
| Funkstown | 22 | 860 | 847 | 0.23% | 1,541 | 1 | Town |
| Cavetown | 23 | 849 | 1,104 | -4.71% | 446 | 2 | CDP |
| Bagtown | 24 | 568 | 400 | 2.9% | 1,040 | 1 | CDP |
| Sharpsburg | 25 | 563 | 553 | 0.36% | 2,536 | 0 | Town |
| Sharpsburg | 26 | 563 | 553 | 0.36% | 2,536 | 0 | Town |
| Fairplay | 27 | 534 | 470 | -0.56% | 444 | 1 | CDP |
| Pinesburg | 28 | 526 | 255 | 0.96% | 719 | 1 | CDP |
| Beaver Creek | 29 | 465 | 539 | 3.33% | 405 | 1 | CDP |
| Tilghmanton | 30 | 462 | 355 | -0.22% | 996 | 0 | CDP |
| Mount Aetna | 31 | 415 | 599 | -2.12% | 294 | 1 | CDP |
| Clear Spring | 32 | 375 | 372 | 0% | 3,099 | 0 | Town |
| Clear Spring | 33 | 375 | 372 | 0% | 3,099 | 0 | Town |
| Mercersville | 34 | 370 | 188 | 4.52% | 1,146 | 0 | CDP |
| Charlton | 35 | 361 | 380 | 3.74% | 2,215 | 0 | CDP |
| San Mar | 36 | 345 | 318 | -0.86% | 740 | 0 | CDP |
| Leitersburg | 37 | 300 | 386 | -5.96% | 171 | 2 | CDP |
| Mount Lena | 38 | 300 | 355 | -4.46% | 239 | 1 | CDP |
| Chewsville | 39 | 268 | 301 | 0.75% | 321 | 1 | CDP |
| Trego-Rohrersville Station | 40 | 263 | 101 | 2.33% | 617 | 0 | CDP |
| Mapleville | 41 | 260 | 308 | 0.39% | 645 | 0 | CDP |
| Rohrersville | 42 | 210 | 280 | 0.96% | 607 | 0 | CDP |
| Breathedsville | 43 | 200 | 281 | -1.96% | 538 | 0 | CDP |
| Dargan | 44 | 195 | 202 | 1.04% | 661 | 0 | CDP |
| Pondsville | 45 | 186 | 39 | 1.09% | 602 | 0 | CDP |
| Mount Briar | 46 | 179 | 117 | 0.56% | 287 | 1 | CDP |
| Cearfoss | 47 | 139 | 115 | -2.11% | 692 | 0 | CDP |
| Jugtown | 48 | 127 | 240 | -3.79% | 380 | 0 | CDP |
| Pecktonville | 49 | 110 | 287 | -2.65% | 187 | 1 | CDP |
| Antietam | 50 | 75 | 45 | 7.14% | 490 | 0 | CDP |
| Ringgold | 51 | 57 | 90 | -10.94% | 198 | 0 | CDP |
| Big Pool | 52 | 50 | 85 | 6.38% | 463 | 0 | CDP |
| Big Spring | 53 | 29 | 50 | 7.41% | 209 | 0 | CDP |
| Ernstville | 54 | 25 | 25 | 8.7% | 168 | 0 | CDP |
| Brownsville | 55 | 15 | 26 | 7.14% | 53 | 0 | CDP |
| Indian Springs | 56 | 14 | 18 | 7.69% | 121 | 0 | CDP |
Hagerstown is the largest city in Washington County, with a population of 44,006.
Indian Springs is the smallest city in Washington County, with a population of 14.
There are 56 cities in Washington County, Maryland.