Pennsylvania Route 646

PA Route 646
Route information
Maintained by PennDOT
Length:	19.153 mi (30.824 km)
Existed:	1928 – present
Major junctions
South end:	PA 59 in Keating Township
	PA 770 in Keating Township PA 46 in Foster Township PA 246 in Otto Township PA 346 in Foster Township
North end:	NY 16 at the New York state line in Foster Township
Location
Counties:	McKean
Highway system
Pennsylvania State Route System Interstate US State Scenic Byways Legislative ← PA 645 PA 647 → ← PA 743 PA 747 →

Pennsylvania Route 646 (PA 646) is a 19.15 miles (30.82 km) long state highway located in McKean county in Pennsylvania. The southern terminus is at PA 59 in Keating Township. The northern terminus is the New York state line in Foster Township. The route continues as New York State Route 16 (NY 16) in Cattaugarus County.

PA 646 was assigned in the 1928 mass numbering of state routes in Pennsylvania. At that time, it consisted entirely of the PA 346–state line stretch in Foster Township. The rest of the stretch consisted of PA 59, now realigned, and PA 746, now decommissioned. PA 746 was decommissioned in 1946, and PA 59 was realigned in 1952, with PA 646 being extended onto its current alignment. The route has remained virtually unchanged since the change in 1952.

PA 646 begins at an intersection with PA 59 in the small borough of Ormsby. The highway, situated around several oil wells, progresses to the northwest through a moderately populated region of residential homes. PA 646 continues on this progression for several miles, parallelling a pipeline running through the Kinzua Valley. After an intersection with a local dirt road, the highway leaves Ormsby and continues into the under-populated forests in Keating Township. The route follows an old railroad grade, entering the small unincorporated place of McKean. When PA 646 turns to the north at a gradual bend, it crosses a second pipeline and enters the community of Cyclone.

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