| Name | Douglas County |
| State | Colorado |
| FIPS Code | 08035 |
| County Seat | Castle Rock |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 385,141 |
| Population Growth Rate(2020-2024) | 7.05% |
| Majority Ethnicity | White 82.47% |
| Public School Majority Ethnicity | White 70% |
| Partisan Voting Index | Republican:+4 |
| Unemployment Rate (May 2026) | 4.0% |
| Sales Tax Rate (2025) | 4% |
| Area Code(s) | 303 / 720 / 983 / 719 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 82.47% |
| African American | 1.45% |
| Hispanic | 9.98% |
| Asian | 5.61% |
| Native American | 0.43% |
| Hawaiin/Pacific Islander | 0.06% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 70.4% |
| African American | 1.48% |
| Hispanic | 14.45% |
| Asian | 6.93% |
| Native American | 0.46% |
| Hawaiin/Pacific Islander | 0.13% |