About This Place
West Middlesex is a borough in Mercer County, Pennsylvania, along the Shenango River. The population was 929 at the 2000 census. It is part of the Youngstown–Warren–Boardman, OH-PA Metropolitan Statistical Area.
West Middlesex is located at 41°10′25″N 80°27′25″W / 41.17361°N 80.45694°W / 41.17361; -80.45694 (41.173630, -80.456874).
According to the United States Census Bureau, the borough has a total area of 0.9 square miles (2.5 km²), all land.