Douglas County
County
One of two county buildings for Douglas County in Castle Rock
Flag
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 / 39.35; -104.93
Country	United States
State	Colorado
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)[1]
• Total	357,978
• Density	426/sq mi (164/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Website	www.douglas.co.us

Douglas County is a county in the state of Colorado in the United States. As of the 2020 census, 357,978 people lived there.^[1] The county seat is Castle Rock.

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