Pennsylvania State Route 51 north-south highway. It runs through Central Allegheny County. For the most part it runs along the Ohio and Monongahela Rivers. PA St Rt 51 passes through the following towns in Allegheny County. Jefferson Hills Lebanon Pittsburgh McKees Rocks Coraopolis PA St Rt 51 is multi-plexed in Allegheny County. TRUCK U.S. Rt. 19, at Pittsburg. U.S. Rt. 19, at Pittsburg. PA St Rt 51 intersects the following highways in Allegheny County. Pennsylvania State Route 136, near Milesville. Pennsylvania State Route 48, near Elizabeth. Pennsylvania State Route 837, near West Elizabeth. Pennsylvania Turnpike State Route 43, near near Jefferson Hills. Pennsylvania State Route 88, at Pittsburgh. TRUCK U.S. Rt. 19, at Pittsburgh. Interstate 279, at Pittsburgh. U.S. Rt. 19, at Pittsburgh. U.S. Rt. 22, at Pittsburgh. TRUCK U.S. Rt. 19, at Pittsburgh. Pennsylvania State Route 60, at Pittsburgh. U.S. Rt. 19, at Pittsburgh. Pennsylvania State Route 837, at Pittsburgh. Interstate 79, near Coraopolis.
