Pennsylvania Route 51

Pennsylvania Route 51
Route information
Maintained by PennDOT
Length	89.227 mi[1] (143.597 km)
Existed	1929–present
Major junctions
South end	US 40 Bus. in Uniontown
Major intersections	US 119 / PA 43 / PA Turnpike 43 near Uniontown I-70 in Rostraver PA Turnpike 43 near Clairton I-376 / US 19 / US 22 / US 30 / US 19 Truck / PA 60 / PA 837 in Pittsburgh I-79 near Coraopolis I-376 in West Mayfield
North end	SR 14 northwest of Darlington
Location
Country	United States
State	Pennsylvania
Counties	Allegheny, Fayette, Westmoreland, Beaver
Highway system
Pennsylvania State Route System Interstate US State Scenic Legislative
← PA 50 → PA 52

Pennsylvania Route 51 (PA 51) is a major state highway that is located in Western Pennsylvania in the United States. It runs for 89 miles (143 km) from Uniontown to the Ohio state line near Darlington, where it connects with Ohio State Route 14.

PA 51 is the termination point for Pennsylvania Route 43, Pennsylvania Route 48 and Pennsylvania Route 88. The route is a major connection from Uniontown and the rest of Fayette County to Pittsburgh.

The highway is four-lane highway that is located south of Pittsburgh; it passes through Pittsburgh's South Hills before narrowing to a two-lane road through several boroughs along the Ohio River. It then becomes four lanes again after passing Chippewa Township in Beaver County and continues to the Ohio border.

In the South Hills, PA 51 (Saw Mill Run Boulevard), along with US 19, is one of the major routes in and out of Pittsburgh, as it provides access to several bridges and tunnels. PA 51 is one of the highways that enters the West End Circle, an intersection in the West End.