Douglas County is the seventh-most populous of the 64 counties of the U.S. state of Colorado. As of the 2010 census, the population was 285,465. The county seat is Castle Rock.
Douglas County is part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area. It is located midway between Colorado's two largest cities, Denver and Colorado Springs. Douglas County has the highest median household income of any Colorado county or statistical equivalent. It is ranked ninth nationally in that category, and has the highest of any county or equivalent not in the DC or NY metro areas.
According to the U.S. Census Bureau, the county has a total area of 844 square miles (2,190 km²), of which 841 square miles (2,180 km²) is land and 2.6 square miles (6.7 km²) (0.3%) is water.
As of the census of 2000, there were 175,766 people, 60,924 households, and 49,835 families residing in the county. The population density was 209 people per square mile (81/km²). There were 63,333 housing units at an average density of 75 per square mile (29/km²). The racial makeup of the county was 92.77% White, 2.51% Asian, 0.95% Black, 0.41% Native American, 0.06% Pacific Islander, 1.43% from other races, and 1.88% from two or more races. 5.06% of the population were Hispanic or Latino of any race.
There were 60,924 households out of which 47.2% had children under the age of 18 living with them, 73.8% were married couples living together, 5.7% had a female householder with no husband present, and 18.2% were non-families. 13.3% of all households were made up of individuals and 1.9% had someone living alone who was 65 years of age or older. The average household size was 2.88 and the average family size was 3.19.
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