Washtenaw County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 344,791. The county seat is Ann Arbor. The county was authorized by legislation in 1822, and was organized as a county in 1826. Washtenaw County comprises the Ann Arbor Metropolitan Statistical Area and is included in the Detroit-Warren-Ann Arbor Combined Statistical Area. The county is home to the University of Michigan, Eastern Michigan University, Washtenaw Community College, and Concordia University Ann Arbor.
According to the U.S. Census Bureau, the county has a total area of 722 square miles (1,870 km²), of which 706 square miles (1,830 km²) is land and 16 square miles (41 km²) (2.3%) is water.
As of the 2010 United States Census, there were 344,791 people residing in the county. 74.5% were White, 12.7% Black or African American, 7.9% Asian, 0.3% Native American, 1.2% of some other race and 3.4% of two or more races. 4.0% were Hispanic or Latino (of any race). 16.0% were of German, 7.6% English, 7.5% Irish, 6.3% American and 5.0% Polish ancestry.
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