Pennsylvania State Route 366 runs briefly into Allegheny County. This runs from Pennsylvania State Route 28 to the Allegheny River and enters Westmoreland County on the Tarentum Bridge. PA St Rt 366 passes through the following town in Allegheny County. Tarentum PA St Rt 366 is not multi-plexed in Allegheny County. PA St Rt 366 intersects the following highway in Allegheny County. Pennsylvania State Route 28, near Tarentum.
WB PA St Rt 366 near Sixth Street in Tarentum. WB PA St Rt 366 near Seventh Street in Tarentum. A set of guild markers in Tarentum. A BGS on NB PA St Rt 28.
