Douglas County | |
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One of two county buildings for Douglas County in Castle Rock | |
![]() Location within the U.S. state of Colorado | |
![]() Colorado's location within the U.S. | |
Coordinates: 39°21′N 104°56′W / 39.35°N 104.93°W | |
Country | ![]() |
State | ![]() |
Founded | November 1, 1861 |
Named for | Stephen A. Douglas |
Seat | Castle Rock |
Largest community | Highlands Ranch |
Area | |
• Total | 843 sq mi (2,180 km2) |
• Land | 840 sq mi (2,200 km2) |
• Water | 2.6 sq mi (7 km2) 0.3% |
Population (2020) | |
• Total | 357,978 |
• Estimate (2023)[1] | 383,906 |
• Density | 426/sq mi (164/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional districts | 4th, 6th |
Website | www |
Douglas County is a county located in the U.S. state of Colorado. As of the 2020 Census, the population was 357,978. The county is named in honor of U.S. Senator Stephen A. Douglas.[2] The county seat is Castle Rock.[3]
Douglas County is part of the Denver–Aurora–Lakewood metropolitan statistical area. It is located midway between Colorado's two largest cities, Denver and Colorado Springs, and contains a portion of Aurora, the state's third-largest city. Douglas County has the highest median household income of any Colorado county or statistical equivalent. It is ranked seventh nationally in that category.