39.86°N 80.22°W / 39.86; -80.22

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Greene County
County
Greene County Courthouse
Flag Seal
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 39°52′N 80°13′W
Country	United States
State	Pennsylvania
Founded	February 9, 1796
Named for	Nathanael Greene
Seat	Waynesburg
Largest borough	Waynesburg
Government
• Chairman of the Board of Commissioners	Jared Edgreen
Area
• Total	578 sq mi (1,500 km2)
• Land	576 sq mi (1,490 km2)
• Water	2.0 sq mi (5 km2)  0.4%
Population  (2020)
• Total	35,954
• Density	62/sq mi (24/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	14th
Website	www.co.greene.pa.us

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Greene County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 35,954.^[1] Its county seat is Waynesburg.^[2] Greene County was created on February 9, 1796, from part of Washington County and named for General Nathanael Greene.

Greene County is part of the Pittsburgh media market. It is in the area of southwestern Pennsylvania that was claimed by Virginia, the District of West Augusta.

According to the U.S. Census Bureau, the county has a total area of 578 square miles (1,500 km²), of which 576 square miles (1,490 km²) is land and 2.0 square miles (5.2 km²) (0.4%) is water.^[3] It has a humid continental climate (Dfa/Dfb) and average monthly temperatures in Waynesburg range from 28.9 °F in January to 71.9 °F in July.^[4]

As of the census^[6] of 2010, there were 38,686 people, 14,724 households, and 9,970 families residing in the county. The population density was 67 people per square mile (26 people/km²). There were 16,678 housing units at an average density of 29 units per square mile (11/km²). The racial makeup of the county was 94.6 percent White, 3.3 percent Black or African American, 0.2% Native American, 0.3 percent Asian, 0.0 percent Pacific Islander, 0.7 percent from other races, and 1.0% from two or more races. 1.2 percent of the population were Hispanic or Latino of any race.

There were 14,724 households, out of which 29.3 percent had children under the age of 18 living with them, 51.5 percent were married couples living together, 10.9 percent had a female householder with no husband present, and 32.3 percent were non-families. 27.0 percent of all households were made up of individuals, and 11.7 percent had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.91.

In the county, the population was spread out, with 19.9 percent under the age of 18, 9.9 percent from 18 to 24, 25.5 percent from 25 to 44, 29.3 percent from 45 to 64, and 15.3 percent who were 65 years of age or older. The median age was 41.1 years. For every 100 females there were 106.2 males. For every 100 females age 18 and over, there were 105.6 males.

Greene County was long a Democratic stronghold, due to the strong unionization of the county's steel mills; between 1932 and 2000, the Democratic presidential candidate won the county in every election except in the Republican landslide of 1972. Due to the decline of the Pittsburgh area's steel industry (similar to other Appalachian counties), and the Democratic Party's shift on cultural issues like the environment and guns, the county has shifted towards the Republican Party, and in 2016 Donald Trump won the county with 68.4% of the vote.

This section needs expansion. You can help by adding to it. (July 2016)

Greene County's development commission has assisted area business since 1998.^[15]

The Meadow Ridge office park has served the county since the early 2000s.^[16]

Two power plant construction projects are underway in Greene County. Hill Top Energy Center, a natural gas-fired power plant with a generating capacity of 625 megawatts, is scheduled to begin operations in the summer of 2021.^[17][18] A new 1,000-megawatt natural gas power plant on the site of the former Hatfield's Ferry power station was scheduled to begin operations in mid-2022, but the plan fell through.^{[19][20][21][22]}

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

• Greene Connections: Greene County, Pennsylvania Archives Project
• National Register of Historic Places listings in Greene County, Pennsylvania