Pennsylvania State Route 551 is an east-west highway in Northwestern Beaver County. It runs from Pennsylvania State Route 18, at Beaver Falls to the Beaver/Lawrence County Line, near Enon Valley. PA St Rt 551 passes through the following towns in Beaver County. Beaver Falls Darlington PA St Rt 551 is multi-plexed in Beaver County. Pennsylvania State Route 168, at Darlington. PA St Rt 551 intersects the following highways in Beaver County. Pennsylvania State Route 18, at Beaver Falls.
Interstate 376, near Beaver Falls. Pennsylvania State Route 168, at Darlington. Pennsylvania State Route 168, at Darlington.
