Pennsylvania State Route 366 runs east-west across Northwestern Westmoreland County. It runs from the Allegheny/Westmoreland County Line at the Allegheny River to a junction with Penssylvania State Route 66, near Mamont. PA St Rt 366 passes through the following towns in Westmoreland County. New Kensington
A set of guide markers NB PA St Rt 366. A BGS on NB PA St Rt 380. WB PA St Rt 366 near Drennen. WB PA St Rt 366; EB TK PA St Rt 56 in New Kensington. Looking at the Allegheny River Bridge on PA St Rt 366 from the New Kensington Bluffs. WB PA St Rt 366 at the Allegheny River. WB PA St Rt 366 crossing the Allegheny River.
