Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hagerstown | 1 | 43,563 | 43,523 | 0.02% | 3,421 | 12.7 | City |
| Halfway | 2 | 10,141 | 10,804 | -0.39% | 2,322 | 4.4 | CDP |
| Robinwood | 3 | 8,183 | 7,482 | 1.13% | 2,151 | 3.8 | CDP |
| Fountainhead-Orchard Hills | 4 | 6,287 | 5,964 | 0.72% | 1,424 | 4.4 | CDP |
| St. James | 5 | 4,298 | 3,567 | 2.28% | 711 | 6.0 | CDP |
| Boonsboro | 6 | 3,831 | 3,799 | 0.21% | 1,255 | 3.1 | Town |
| Smithsburg | 7 | 3,203 | 2,986 | 1.71% | 2,759 | 1.2 | Town |
| Paramount-Long Meadow | 8 | 2,832 | 2,834 | 0.64% | 1,298 | 2.2 | CDP |
| Maugansville | 9 | 2,720 | 2,148 | -0.91% | 1,111 | 2.4 | CDP |
| Williamsport | 10 | 2,088 | 2,079 | 0.1% | 2,124 | 1.0 | Town |
| Wilson-Conococheague | 11 | 1,596 | 2,014 | -2.98% | 338 | 4.7 | CDP |
| Hancock | 12 | 1,558 | 1,553 | 0.06% | 523 | 3.0 | Town |
| Keedysville | 13 | 1,218 | 1,213 | 0.08% | 1,440 | 0.8 | Town |
| Downsville | 14 | 1,012 | 863 | 4.87% | 1,619 | 0.6 | CDP |
| Cavetown | 15 | 891 | 1,104 | -4.4% | 468 | 1.9 | CDP |
| Funkstown | 16 | 852 | 850 | 0% | 1,527 | 0.6 | Town |
| Sharpsburg | 17 | 564 | 562 | 0% | 2,541 | 0.2 | Town |
| Bagtown | 18 | 552 | 400 | 2.79% | 1,011 | 0.5 | CDP |
| Fairplay | 19 | 537 | 470 | -0.56% | 446 | 1.2 | CDP |
| Pinesburg | 20 | 521 | 255 | 0.97% | 712 | 0.7 | CDP |
| Tilghmanton | 21 | 463 | 355 | 0% | 998 | 0.5 | CDP |
| Beaver Creek | 22 | 450 | 539 | 3.21% | 392 | 1.1 | CDP |
| Mount Aetna | 23 | 424 | 599 | -2.3% | 300 | 1.4 | CDP |
| Clear Spring | 24 | 369 | 371 | -0.27% | 3,050 | 0.1 | Town |
| Mercersville | 25 | 354 | 188 | 4.73% | 1,096 | 0.3 | CDP |
| Charlton | 26 | 348 | 380 | 3.57% | 2,135 | 0.2 | CDP |
| San Mar | 27 | 348 | 318 | -0.57% | 747 | 0.5 | CDP |
| Leitersburg | 28 | 319 | 386 | -5.34% | 182 | 1.8 | CDP |
| Mount Lena | 29 | 314 | 355 | -4.56% | 251 | 1.3 | CDP |
| Chewsville | 30 | 266 | 301 | 0.76% | 319 | 0.8 | CDP |
| Mapleville | 31 | 259 | 308 | 0.39% | 643 | 0.4 | CDP |
| Trego-Rohrersville Station | 32 | 257 | 101 | 2.39% | 603 | 0.4 | CDP |
| Rohrersville | 33 | 208 | 280 | 1.46% | 601 | 0.3 | CDP |
| Breathedsville | 34 | 204 | 281 | -1.45% | 548 | 0.4 | CDP |
| Dargan | 35 | 193 | 202 | 1.05% | 654 | 0.3 | CDP |
| Pondsville | 36 | 184 | 39 | 1.1% | 595 | 0.3 | CDP |
| Mount Briar | 37 | 178 | 117 | 1.14% | 286 | 0.6 | CDP |
| Cearfoss | 38 | 142 | 115 | -1.39% | 706 | 0.2 | CDP |
| Jugtown | 39 | 132 | 240 | -3.65% | 395 | 0.3 | CDP |
| Reid | 40 | 116 | 0 | 8.41% | 928 | 0.1 | CDP |
| Pecktonville | 41 | 113 | 287 | -3.42% | 192 | 0.6 | CDP |
| Antietam | 42 | 70 | 45 | 7.69% | 458 | 0.2 | CDP |
| Ringgold | 43 | 64 | 90 | -11.11% | 222 | 0.3 | CDP |
| Big Pool | 44 | 47 | 85 | 9.3% | 435 | 0.1 | CDP |
| Big Spring | 45 | 27 | 50 | 8% | 194 | 0.1 | CDP |
| Ernstville | 46 | 23 | 25 | 4.54% | 154 | 0.1 | CDP |
| Brownsville | 47 | 14 | 26 | 7.69% | 49 | 0.3 | CDP |
| Indian Springs | 48 | 13 | 18 | 8.33% | 112 | 0.1 | CDP |
| Kemps Mill | 49 | 10 | 0 | -47.37% | 39 | 0.3 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Hagerstown is the largest city in Washington County.
Kemps Mill is the smallest city in Washington County.
There are 49 cities in Washington County, Maryland.