Eighty Four is a census-designated place in Somerset, Nottingham, North Strabane, and South Strabane townships in Washington County, Pennsylvania. It lies approximately 25 miles southwest of Pittsburgh and is in the Pittsburgh metropolitan area. The population was 645 at the 2020 census. Eighty Four contains the 84 Lumber company's headquarters. Eighty Four is a part of the Canon-McMillan, Trinity, Ringgold, and Bentworth school districts.