According to theU.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 hot-summerhumid continental climate (Dfa) and average monthly temperatures in Waynesburg range from 28.9 °F in January to 71.9 °F in July.[4] Greene County is one of the 423 counties served by theAppalachian Regional Commission,[5] and it is identified as part of "Greater Appalachia" by Colin Woodard in his bookAmerican Nations: A History of the Eleven Rival Regional Cultures of North America.[6] It is also located within the Laurel Highlands subrange, which consists of low plateaus and river valleys.
As of thecensus[8] of 2010, there were 38,686 people, 14,724 households, and 9,970 families residing in the county. Thepopulation 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 percentWhite, 3.3 percentBlack orAfrican American, 0.2%Native American, 0.3 percentAsian, 0.0 percentPacific Islander, 0.7 percent fromother races, and 1.0% from two or more races. 1.2 percent of the population wereHispanic orLatino 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 aDemocratic 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 otherAppalachian counties), and the Democratic Party's shift on cultural issues like environmental safety and firearms, the county was a landslide for the Republican Party in 2024 forDonald Trump who won the county with 71.5% of the vote.
United States presidential election results for Greene County, Pennsylvania[10]
As of February 8, 2025, there are 21,629 registered voters in the county. There are 11,762 registeredRepublicans, 7,727 registeredDemocrats, 1,542 voters registerednon-affiliated voters, and 598 voters registered toother parties.[12]
Greene County is administered by a three-person board of commissioners, who serve four-year terms. Elections occur in the odd-numbered years that precede U.S. presidential elections, with the most recent election falling in 2023. All three commissioners are chosen in the same election, and voters may vote for no more than two of the candidates. The commissioners are responsible for the management of the fiscal and administrative functions of the county.[13]
Greene County consists of one Pennsylvania House District. The 50th district covers all of Greene County and parts ofWashington County to the north.[14]
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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, anatural 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 formerHatfield's Ferry power station was scheduled to begin operations in mid-2022, but the plan fell through.[19][20][21][22]
Map of Greene County, Pennsylvania with Municipal Labels showing Boroughs (red), Townships (white), and Census-designated places (blue).
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:
Census-designated places are geographical areas designated by theU.S. Census Bureau for the purposes of compiling demographic data. They are not actual jurisdictions under Pennsylvania law. Other unincorporated communities, such as villages, may be listed here as well.
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