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 |
|---|---|---|---|---|---|---|---|
| Castle Rock | 1 | 83,924 | 73,886 | 3.08% | 2,416 | 34.7 | Town |
| Parker | 2 | 64,031 | 58,879 | 2.05% | 2,853 | 22.4 | Town |
| Castle Pines | 3 | 15,924 | 11,215 | 7.98% | 1,660 | 9.6 | City |
| Black Forest | 4 | 14,657 | 13,103 | 0.76% | 146 | 100.6 | CDP |
| The Pinery | 5 | 10,537 | 10,033 | 0.02% | 1,015 | 10.4 | CDP |
| Stonegate | 6 | 9,905 | 9,860 | 0.69% | 5,410 | 1.8 | CDP |
| Roxborough Park | 7 | 9,050 | 9,004 | -0.04% | 980 | 9.2 | CDP |
| Castle Pines Village | 8 | 5,206 | 4,558 | 7.7% | 1,169 | 4.5 | CDP |
| Sierra Ridge | 9 | 3,422 | 1,742 | 7.71% | 6,750 | 0.5 | CDP |
| Stepping Stone | 10 | 3,227 | 1,798 | 7.71% | 4,390 | 0.7 | CDP |
| Meridian Village | 11 | 2,916 | 2,840 | 7.72% | 5,718 | 0.5 | CDP |
| Acres Green | 12 | 2,564 | 2,888 | -1.2% | 4,266 | 0.6 | CDP |
| Sterling Ranch | 13 | 2,217 | 521 | 7.73% | 401 | 5.5 | CDP |
| Perry Park | 14 | 1,723 | 1,821 | 0.29% | 201 | 8.6 | CDP |
| Grand View Estates | 15 | 831 | 760 | 2.59% | 833 | 1.0 | CDP |
| Franktown | 16 | 344 | 214 | -0.86% | 117 | 2.9 | CDP |
| Westcreek | 17 | 306 | 273 | 4.08% | 252 | 1.2 | CDP |
| Louviers | 18 | 266 | 381 | 0% | 168 | 1.6 | CDP |
| Larkspur | 19 | 222 | 208 | 1.37% | 140 | 1.6 | Town |
| Sedalia | 20 | 10 | 103 | -58.33% | 7 | 1.4 | 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.
Castle Rock is the largest city in Douglas County.
Sedalia is the smallest city in Douglas County.
There are 20 cities in Douglas County, Colorado.