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Washington County is a county in the Commonwealth of Pennsylvania, United States. As of the 2020 census, the population was 209,349. Its county seat is Washington.

Washington County is part of the Pittsburgh, PA Metropolitan Statistical Area.

The county is home to Washington County Airport, three miles (4.8 km) southwest of 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. The town of Charleroi got its name from the Belgian city of Charleroi. There lived many Belgian immigrants in the Monongahela area at the end of the 19th century, some of whom were glass makers.

According to the U.S. Census Bureau, the county has a total area of 861 square miles (2,230 km), of which 857 square miles (2,220 km²) is land and 3.9 square miles (10 km) (0.5%) is water.

The flag of Washington County, Pennsylvania consists of a light blue background with the county’s seal in the middle. The seal consists of the county courthouse, a covered bridge, an Indian, and an early settler. This montage has the words “Historical Washington County” and “1781” inside a circle.

Washington County has a humid continental climate (Köppen Dfb), with warm summers and cold, snowy winters. Precipitation is highest in the summer months, with an annual average of 38.87 in (987 mm). Snow usually falls between November and April, with an average of 37.8 in (96 cm).

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 (92 people/km²). There were 87,267 housing units at an average density of 102 per square mile (39/km). 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.

The Democratic Party has been historically dominant in county-level politics and national politics between 1932 and 2004, only voting Republican for president in Richard Nixon’s 1972 landslide victory over George McGovern.
However, like much of Appalachian coal country, Washington has trended strongly Republican in recent years. In 2000, Democrat Al Gore won 53% of the vote and Republican George W. Bush won 44%. In 2004, Democrat John Kerry received 50.14% of the vote and Bush received 49.57% a difference of 552 votes. In 2008, Republican John McCain won 51% to Democrat Barack Obama’s 46% and each of the three state row office winners carried Washington County.

As of May 15, 2023, there are 141,421 registered voters in Washington county. Registered Republicans have a plurality of 67,247 registered voters, compared to 56,658 registered Democrats, 13,523 registered non-affiliated voters, and 3,993 voters registered to other parties.

Washington County is administered by a three-member publicly elected commission. Each commissioner serves in four-year terms. Elections occur in the odd-numbered years that precede U.S. presidential elections. All three Commissioners are chosen in the same election, and voters may vote for no more than two of the candidates. By state law, the commission must have a minority party guaranteeing a political split on the commission. The Commissioners are responsible for the management of the fiscal and administrative functions of the county.

Maggi was the Democratic nominee for Pennsylvania’s 18th congressional district against Republican incumbent Tim Murphy in 2012. Maggi lost to Murphy and earned only 36 percent of the vote. Irey Vaughan was the Republican candidate for Pennsylvania’s 12th congressional district and lost to the late Democratic incumbent John Murtha in the 2006 election.

Pony League baseball was founded in Washington County in 1951 for 13 and 14 year old boys and its headquarters are located here. As of 2016, more than a half-million youth in the U.S. and 40 other nations participate. The televised Pony League World Series held annually in August at Washington’s Lew Hays Pony Field attracts teenage teams from around the world.

Washington County is also the home of the Pennsylvania Trolley Museum. Washington County is also famous for its Rock Shelters at Meadowcroft Village, which are one of the best preserved and oldest Pre-Clovis Native American dwellings in the country. The county has 21 covered bridges still standing.

The Whiskey Rebellion culminated in Washington. The home of David Bradford, one of the rebellion leaders, is located in Washington and is a national landmark. Just a couple blocks away is the F. Julius LeMoyne House, which serves as the headquarters of the Washington County Historical Society.

Washington County is the home of the first crematory in the United States.

In 1981, the Pennsylvania Historical and Museum Commission installed a historical marker noting the historic importance of the county.

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following cities, boroughs and townships are located in Washington County:

Census-designated places are geographical areas designated by the U.S. Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law.

The population ranking of the following table is based on the 2010 census of Washington County.

† county seat