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Monroeville, 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...