Douglas County, Colorado

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Douglas County
One of two county buildings for Douglas County in Castle Rock
One of two county buildings for Douglas County in Castle Rock
Map of Colorado highlighting Douglas County
Location within the U.S. state of Colorado
Map of the United States highlighting 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
FoundedNovember 1, 1861
Named forStephen A. Douglas
SeatCastle Rock
Largest communityHighlands Ranch
Area
 • Total843 sq mi (2,180 km2)
 • Land840 sq mi (2,200 km2)
 • Water2.6 sq mi (7 km2)  0.3%%
Population
 • Estimate 
(2019)
351,154
 • Density399/sq mi (154/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Congressional districts4th, 6th
Websitewww.douglas.co.us

Douglas County is a county in the state of Colorado in the United States. As of the 2010 census, 285,465 people lived there. The county seat is Castle Rock.