Murrysville is a home rule municipality in Westmoreland County, Pennsylvania, United States. The population was 21,006 at the 2020 census. It is part of the Pittsburgh metropolitan area.

Westmoreland County is a county in the Commonwealth of Pennsylvania, United States, located in the Pittsburgh Metropolitan Statistical Area. As of the 2020 census, the population was 354,663. The county seat is Greensburg and the most populous community is Hempfield Township. It is named after Westmorland, a historic county of England. The county is part of the Southwest Pennsylvania region of the state.