Mason County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 60,699. The county seat and only incorporated city is Shelton. The county was formed out of King County on March 13, 1854. Originally named Sawamish County, it took its present name in 1864 in honor of Charles H. Mason, the first Secretary of Washington Territory.
Mason County comprises the Shelton, WA Micropolitan Statistical Area and is included in the Seattle-Tacoma, WA Combined Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 1,051 square miles (2,720 km²), of which 959 square miles (2,480 km²) is land and 92 square miles (240 km²) (8.7%) is water.
As of the 2010 United States Census, there were 60,699 people, 23,832 households, and 16,057 families residing in the county. The population density was 63.3 inhabitants per square mile (24.4/km²). There were 32,518 housing units at an average density of 33.9 per square mile (13.1/km²). The racial makeup of the county was 86.1% white, 3.7% American Indian, 1.2% Asian, 1.1% black or African American, 0.4% Pacific islander, 3.4% from other races, and 4.1% from two or more races. Those of Hispanic or Latino origin made up 8.0% of the population. In terms of ancestry, 19.7% were German, 13.8% were English, 13.5% were Irish, 6.7% were Norwegian, and 4.9% were American.
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