Jefferson Township is a township that is located in Greene County, Pennsylvania, United States. The population was 2,352 at the time of the 2020 census, even with the 2,352 at the 2010 census.

Greene County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 35,954. Its county seat is Waynesburg. Greene County was created on February 9, 1796, from part of Washington County and named for General Nathanael Greene. The county is part of the Southwest Pennsylvania region of the state.