| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Frederick | 1 | 94,796 | 78,396 | 2.97% | 3,860 | 25 | City |
| Mount Airy | 2 | 9,917 | 9,645 | 0.61% | 2,405 | 4 | Town |
| Brunswick | 3 | 9,681 | 7,805 | 3.21% | 2,956 | 3 | City |
| Walkersville | 4 | 6,584 | 6,165 | 1.28% | 1,382 | 5 | Town |
| Thurmont | 5 | 6,362 | 6,204 | 0.39% | 2,048 | 3 | Town |
| Middletown | 6 | 5,081 | 4,947 | 0.49% | 2,399 | 2 | Town |
| Emmitsburg | 7 | 2,946 | 2,766 | 1.24% | 1,822 | 2 | Town |
| Myersville | 8 | 1,900 | 1,806 | 0.8% | 1,486 | 1 | Town |
| New Market | 9 | 1,629 | 1,524 | 1.24% | 920 | 2 | Town |
| Woodsboro | 10 | 1,141 | 1,089 | 0.44% | 1,614 | 1 | Town |
| Rosemont | 11 | 258 | 255 | 0% | 464 | 1 | Village |
| Burkittsville | 12 | 145 | 142 | 0% | 319 | 0 | Town |
Frederick is the largest city in Frederick County, with a population of 94,796.
Burkittsville is the smallest city in Frederick County, with a population of 145.
There are 12 cities in Frederick County, Maryland.