9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hagerstown | 1 | 44,104 | 43,518 | 0.22% | 3,327 | 13 | City |
| Boonsboro | 2 | 3,886 | 3,778 | 0.47% | 1,267 | 3 | Town |
| Smithsburg | 3 | 3,293 | 2,995 | 1.54% | 2,836 | 1 | Town |
| Williamsport | 4 | 2,114 | 2,078 | 0.28% | 2,151 | 1 | Town |
| Hancock | 5 | 1,579 | 1,552 | 0.32% | 530 | 3 | Town |
| Keedysville | 6 | 1,237 | 1,212 | 0.32% | 1,462 | 1 | Town |
| Funkstown | 7 | 863 | 847 | 0.35% | 1,547 | 1 | Town |
| Sharpsburg | 8 | 565 | 553 | 0.36% | 2,545 | 0 | Town |
| Clear Spring | 9 | 376 | 372 | 0.27% | 3,107 | 0 | Town |
Hagerstown is the largest city in Washington County, with a population of 44,104.
Clear Spring is the smallest city in Washington County, with a population of 376.
There are 9 cities in Washington County, Maryland.