9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hagerstown | 1 | 44,006 | 43,518 | 0.22% | 3,319 | 13 | City |
| Boonsboro | 2 | 3,868 | 3,778 | 0.47% | 1,262 | 3 | Town |
| Smithsburg | 3 | 3,243 | 2,995 | 1.53% | 2,793 | 1 | Town |
| Williamsport | 4 | 2,108 | 2,078 | 0.29% | 2,144 | 1 | Town |
| Hancock | 5 | 1,574 | 1,552 | 0.25% | 529 | 3 | Town |
| Keedysville | 6 | 1,233 | 1,212 | 0.33% | 1,457 | 1 | Town |
| Funkstown | 7 | 860 | 847 | 0.23% | 1,541 | 1 | Town |
| Sharpsburg | 8 | 563 | 553 | 0.36% | 2,536 | 0 | Town |
| Clear Spring | 9 | 375 | 372 | 0% | 3,099 | 0 | Town |
Hagerstown is the largest city in Washington County, with a population of 44,006.
Clear Spring is the smallest city in Washington County, with a population of 375.
There are 9 cities in Washington County, Maryland.