Pennsylvania Route 478

Pennsylvania Route 478
Route information
Maintained by PennDOT
Length	2.20 mi[1] (3.54 km)
Existed	1961–present
Major junctions
West end	PA 38 / PA 208 near Emlenton
Major intersections	I-80 near Emlenton
East end	PA 58 in St. Petersburg
Location
Country	United States
State	Pennsylvania
Counties	Clarion, Venango
Highway system
Pennsylvania State Route System Interstate US State Scenic Legislative
← PA 477 → I-479

Pennsylvania Route 478 (PA 478) is a 2.20-mile-long (3.54 km) state highway located in Clarion and Venango counties. The highway begins at an intersection with PA 38 and PA 208 northeast of Emlenton. The highway serves the eastbound interchange for Exit 45 on Interstate 80 (I-80) and terminates at PA 58 in St. Petersburg.

The alignment of PA 478 began as part of the former alignment of PA 238 until 1936, when PA 378 was designated on the alignment. In 1961, to avoid duplication with the newly numbered I-378 in Bethlehem, the route was redesignated as PA 478.