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Washington County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 207,820. Its county seat is Washington. The county was created on March 28, 1781, from part of Westmoreland County. The city and county were both named after American Revolutionary War leader George Washington, who eventually became the first President of the United States.
Washington County is part of the Pittsburgh, PA Metropolitan Statistical Area.
The county is home to Washington County Airport, located three miles (5 km) southwest of Washington.
As of the census of 2000, there were 202,897 people, 81,130 households, and 56,060 families residing in the county. The population density was 237 people per square mile (91/km²). There were 87,267 housing units at an average density of 102 per square mile (39/km²). The racial makeup of the county was 95.27% White, 3.26% Black or African American, 0.09% Native American, 0.36% Asian, 0.02% Pacific Islander, 0.19% from other races, and 0.82% from two or more races. 0.58% of the population were Hispanic or Latino of any race. 18.3% were of German, 17.2% Italian, 10.6% Irish, 8.6% English, 7.9% Polish and 6.2% American ancestry.
There were 81,130 households out of which 28.40% had children under the age of 18 living with them, 55.20% were married couples living together, 10.30% had a female householder with no husband present, and 30.90% were non-families. 27.00% of all households were made up of individuals and 13.20% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.96.
In the county, the population was spread out with 22.20% under the age of 18, 7.70% from 18 to 24, 27.20% from 25 to 44, 25.00% from 45 to 64, and 17.90% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 92.40 males. For every 100 females age 18 and over, there were 89.00 males.
As of 1800, this county was largely settled by people of Scot-Irish heritage because “prime lands” were already taken by the Germans and the Quakers.