19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Castle Rock | 1 | 86,434 | 73,886 | 2.99% | 2,488 | 34.74 | Town |
| Parker | 2 | 65,319 | 58,879 | 2.01% | 2,910 | 22.45 | Town |
| Castle Pines | 3 | 17,101 | 11,215 | 7.39% | 1,783 | 9.59 | City |
| Black Forest | 4 | 14,767 | 13,103 | 0.75% | 147 | 100.64 | CDP |
| The Pinery | 5 | 10,538 | 10,033 | 0.01% | 1,015 | 10.38 | CDP |
| Stonegate | 6 | 9,972 | 9,860 | 0.68% | 5,446 | 1.83 | CDP |
| Roxborough Park | 7 | 9,046 | 9,004 | -0.04% | 980 | 9.23 | CDP |
| Castle Pines Village | 8 | 5,577 | 4,558 | 7.13% | 1,253 | 4.45 | CDP |
| Sierra Ridge | 9 | 3,666 | 1,742 | 7.13% | 7,231 | 0.51 | CDP |
| Stepping Stone | 10 | 3,458 | 1,798 | 7.16% | 4,705 | 0.73 | CDP |
| Meridian Village | 11 | 3,124 | 2,840 | 7.13% | 6,125 | 0.51 | CDP |
| Acres Green | 12 | 2,532 | 2,888 | -1.25% | 4,213 | 0.60 | CDP |
| Sterling Ranch | 13 | 2,375 | 521 | 7.13% | 430 | 5.53 | CDP |
| Perry Park | 14 | 1,728 | 1,821 | 0.29% | 202 | 8.55 | CDP |
| Grand View Estates | 15 | 853 | 760 | 2.65% | 855 | 1 | CDP |
| Franktown | 16 | 340 | 214 | -1.16% | 115 | 2.94 | CDP |
| Westcreek | 17 | 319 | 273 | 4.25% | 262 | 1.22 | CDP |
| Louviers | 18 | 265 | 381 | -0.38% | 168 | 1.58 | CDP |
| Larkspur | 19 | 226 | 208 | 1.8% | 142 | 1.59 | Town |
Castle Rock is the largest city in Douglas County, with a population of 86,434.
Larkspur is the smallest city in Douglas County.
There are 19 cities in Douglas County, Colorado.