| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hagerstown | 1 | 44,370 | 43,538 | 0.32% | 3,347 | 13 | City |
| Boonsboro | 2 | 3,882 | 3,790 | 0.39% | 1,266 | 3 | Town |
| Smithsburg | 3 | 3,264 | 2,992 | 1.62% | 2,811 | 1 | Town |
| Williamsport | 4 | 2,119 | 2,082 | 0.33% | 2,156 | 1 | Town |
| Hancock | 5 | 1,588 | 1,547 | 0.44% | 533 | 3 | Town |
| Keedysville | 6 | 1,230 | 1,197 | 0.41% | 1,454 | 1 | Town |
| Funkstown | 7 | 866 | 847 | 0.35% | 1,552 | 1 | Town |
| Sharpsburg | 8 | 575 | 559 | 0.35% | 2,590 | 0 | Town |
| Clear Spring | 9 | 379 | 371 | 0.26% | 3,132 | 0 | Town |
Hagerstown is the largest city in Washington County, with a population of 44,370.
Clear Spring is the smallest city in Washington County, with a population of 379.
There are 9 cities in Washington County, Maryland.