borough (municipality), Allegheny county, southwestern Pennsylvania, U.S., on the Pennsylvania Turnpike, 13 miles (21 km) east of Pittsburgh. In the 19th century it was widely known as a stagecoach stop between Pittsburgh and Philadelphia, and its subsequent growth resulted from its location as a transportation hub. Formerly Patton township, it became a borough in 1951 and was renamed for its first postmaster, Joel Monroe (appointed 1851). Monroeville is noted for company research facilities and has planned industrial development. The National Science Foundation maintains a supercomputing centre there. The Boyce campus of the Community College of Allegheny County (1966) is in the borough. Pop. (1990) 29,169; (2000) 29,349.