Washington County is a county located in the U.S. state of Minnesota. As of the 2010 census, the population was 238,136, making it the fifth-most populous county in Minnesota. Its county seat is Stillwater. The largest city in the county is Woodbury, which had a population of 61,961 at the 2010 census. The county was established in 1849.
According to the U.S. Census Bureau, the county has a total area of 423 square miles (1,100 km²), of which 384 square miles (990 km²) is land and 38 square miles (98 km²) (9.1%) is water. It is the fourth-smallest county in Minnesota by land area and fifth-smallest by total area.
As of the census of 2010, there were 238,136 people, 87,446 households, and 64,299 families residing in the county. The population density was 607 people per square mile (235/km²). There were 87,446 housing units at an average density of 223 per square mile (86/km²). 39.4% were of German, 14.4% Irish, 13.0% Norwegian, and 9.9% Swedish ancestry. There were 87,446 households out of which 38.6% had children under the age of 18 living with them, 60.6% were married couples living together, 9.5% had a female householder with no husband present, and 26.5% were non-families. 21.5% of all households were made up of individuals and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.14.
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