12 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Frederick | 1 | 95,108 | 78,395 | 3.02% | 3,872 | 25 | City |
| Mount Airy | 2 | 10,047 | 9,647 | 0.67% | 2,437 | 4 | Town |
| Brunswick | 3 | 9,623 | 7,799 | 3.26% | 2,938 | 3 | City |
| Walkersville | 4 | 6,718 | 6,169 | 1.39% | 1,410 | 5 | Town |
| Thurmont | 5 | 6,362 | 6,200 | 0.43% | 2,048 | 3 | Town |
| Middletown | 6 | 5,108 | 4,949 | 0.53% | 2,412 | 2 | Town |
| Emmitsburg | 7 | 2,996 | 2,768 | 1.28% | 1,853 | 2 | Town |
| Myersville | 8 | 1,896 | 1,802 | 0.85% | 1,482 | 1 | Town |
| New Market | 9 | 1,650 | 1,526 | 1.29% | 932 | 2 | Town |
| Woodsboro | 10 | 1,125 | 1,091 | 0.54% | 1,591 | 1 | Town |
| Rosemont | 11 | 271 | 265 | 0.37% | 487 | 1 | Village |
| Burkittsville | 12 | 146 | 142 | 0.69% | 322 | 0 | Town |
Frederick is the largest city in Frederick County, with a population of 95,108.
Burkittsville is the smallest city in Frederick County, with a population of 146.
There are 12 cities in Frederick County, Maryland.