Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Frederick | 1 | 88,270 | 78,360 | 2.89% | 3,684 | 24.0 | City |
| Ballenger Creek | 2 | 25,334 | 21,484 | 2.03% | 2,347 | 10.8 | CDP |
| Green Valley | 3 | 15,143 | 12,391 | 7.69% | 886 | 17.1 | CDP |
| Urbana | 4 | 14,073 | 12,362 | 2.55% | 1,810 | 7.8 | CDP |
| Linganore | 5 | 12,424 | 9,988 | 2.28% | 1,501 | 8.3 | CDP |
| Mount Airy | 6 | 9,964 | 9,662 | 0.76% | 2,417 | 4.1 | Town |
| Brunswick | 7 | 8,480 | 7,796 | 2.06% | 2,589 | 3.3 | City |
| Thurmont | 8 | 6,824 | 6,246 | 2.16% | 2,196 | 3.1 | Town |
| Walkersville | 9 | 6,753 | 6,179 | 2.16% | 1,418 | 4.8 | Town |
| Spring Ridge | 10 | 5,674 | 5,612 | -0.14% | 2,108 | 2.7 | CDP |
| Middletown | 11 | 5,421 | 4,963 | 2.15% | 2,559 | 2.1 | Town |
| Monrovia | 12 | 3,407 | 1,556 | 6.67% | 1,518 | 2.2 | CDP |
| Emmitsburg | 13 | 3,019 | 2,777 | 2.03% | 1,867 | 1.6 | Town |
| Braddock Heights | 14 | 2,898 | 3,093 | 0.69% | 543 | 5.3 | CDP |
| Jefferson | 15 | 2,847 | 2,577 | 1.86% | 1,022 | 2.8 | CDP |
| Bartonsville | 16 | 2,527 | 1,786 | 3.14% | 1,183 | 2.1 | CDP |
| Point Rocks | 17 | 2,509 | 2,067 | 3.08% | 2,240 | 1.1 | CDP |
| Adamstown | 18 | 2,398 | 2,130 | 0.08% | 2,254 | 1.1 | CDP |
| Myersville | 19 | 1,985 | 1,816 | 2.16% | 1,710 | 1.2 | Town |
| New Market | 20 | 1,676 | 1,536 | 2.13% | 947 | 1.8 | Town |
| Libertytown | 21 | 1,329 | 831 | 2.07% | 552 | 2.4 | CDP |
| Buckeystown | 22 | 1,271 | 1,289 | 1.44% | 1,392 | 0.9 | CDP |
| Woodsboro | 23 | 1,199 | 1,099 | 2.13% | 1,696 | 0.7 | Town |
| Highfield-Cascade | 24 | 1,018 | 912 | -0.59% | 588 | 1.7 | CDP |
| Sabillasville | 25 | 414 | 390 | 1.22% | 247 | 1.7 | CDP |
| Lewistown | 26 | 382 | 410 | 7.91% | 597 | 0.6 | CDP |
| Garretts Mill | 27 | 327 | 350 | 1.87% | 573 | 0.6 | CDP |
| Rosemont | 28 | 297 | 275 | 1.71% | 534 | 0.6 | Village |
| Edgemont | 29 | 246 | 277 | 0.41% | 464 | 0.5 | CDP |
| Graceham | 30 | 237 | 304 | 7.73% | 495 | 0.5 | CDP |
| Sandy Hook | 31 | 206 | 193 | 0.98% | 954 | 0.2 | CDP |
| Yarrowsburg | 32 | 178 | 274 | 1.71% | 784 | 0.2 | CDP |
| Burkittsville | 33 | 151 | 141 | 1.34% | 333 | 0.5 | Town |
| Greensburg | 34 | 98 | 126 | -9.26% | 243 | 0.4 | CDP |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Frederick is the largest city in Frederick County.
Greensburg is the smallest city in Frederick County.
There are 34 cities in Frederick County, Maryland.