Richhill Township, Greene County, Pennsylvania  Richhill Township is a township in Greene County, Pennsylvania, United States. The population was 896 at the 2010 census, down from 1,062 at the 2000 census. Ryerson Station State Park is a Pennsylvania state park on Duke Lake in the township. A significant Monongahela village was once located in northern Richhill Township, along the Enlow Fork. Today, the village is known as the Fisher Site, and it is listed on the National Register of Historic Places. Richhill Township is in the northwest corner of Greene County. It is bordered to the north, across the Enlow Fork, by Washington County and to the west by the state of West Virginia. Wind Ridge is the primary settlement in the township. Other unincorporated communities include Burdette, Nebo, Time, Crabapple, Durbin, Crows Mills, Ryerson Station, Bristoria, Bryan, Smith Bridge, and Riggs. According to the United States Census Bureau, the township has a total area of , of which are land and , or 0.15%, are water. The Enlow Fork of Wheeling Creek forms the northern border of the township (and the Greene County line), and the Dunkard Fork of Wheeling Creek, along with its North and South forks, flow across the southern portion of the township. The Enlow and Dunkard Forks flow west into West Virginia, where Wheeling Creek continues northwest to the Ohio River. As of the census of 2000, there were 1,062 people, 402 households, and 299 families residing in the township. The population density was 19.0 people per square mile (7.3/km²). There were 518 housing units at an average density of 9.3/sq mi (3.6/km²). The racial makeup of the township was 98.59% White, 0.09% African American, 0.09% from other races, and 1.22% from two or more races. Hispanic or Latino of any race were 0.47% of the population. There were 402 households, out of which 35.6% had children under the age of 18 living with them, 59.7% were married couples living together, 9.2% had a female householder with no husband present, and 25.6% were non-families. 23.9% of all households were made up of individuals, and 10.9% had someone living alone who was 65 years of age or older.