Eighty Four is a small unincorporated community mostly within Somerset Township in Washington County, Pennsylvania, United States. It lies approximately 25 miles southwest of Pittsburgh and is in the Pittsburgh metropolitan area. Eighty Four is home to the 84 Lumber company's world headquarters and home of the first 84 Lumber store. It is also a part of the Canon-McMillan, Trinity, Ringgold, and Bentworth school districts. Eighty Four is accessible via Pennsylvania Route 519 and Route 136 and interstates 79 and 70. The closest international airport is the Pittsburgh International Airport in Findlay Township.