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.Washington County is included in the Minneapolis-St. Paul-Bloomington, MN-WI Metropolitan Statistical Area.
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