Pennsylvania Route 8

Pennsylvania Route 8 (PA 8) is a major 148.6-mile-long (239.1 km) state route in western Pennsylvania. Officially, PA 8 is named the William Flinn Highway.

Its southern terminus is at Interstate 376 (I-376)/U.S. Route 22 (US 22)/US 30 in Pittsburgh. Its northern terminus is US 20 in Erie.