Pennsylvania Route 405

PA Route 405
Major highways in the Williamsport area with PA 405 in red.
Route information
Maintained by PennDOT
Length:	27.963 mi (45.002 km)
Existed:	1941 – present
Major junctions
South end:	PA 147 near Lewisburg
	I-180 in Muncy
North end:	US 220 in Hughesville
Location
Counties:	Lycoming, Northumberland
Highway system
Pennsylvania State Route System Interstate US State Scenic Byways Legislative ← PA 404 PA 407 →

Pennsylvania Route 405 (PA 405) is a 27.963-mile-long (45.002 km) state highway that runs in the north-central part of the U.S. state of Pennsylvania. The southern terminus of PA 147 in West Chillisquaque Township near the borough of Milton. The route heads northward along the West Branch Susquehanna River through Milton, Watsontown and Muncy until entering Hughesville, where it terminates at an intersection with U.S. Route 220 (US 220).

PA 405 originated as the Muncy and Hughesville Plank Road, a 5-mile (8.0 km) plank road from Muncy to Hughesville, created in 1853. The plank road also consisted of a bridge over the Muncy Canal on the outskirts of the community. PA 405 was assigned in 1941, after switching between numerous designations, including alignments of US 15, US 111, US 220, and US 711. The alignment of PA 405 was extended to its current southern terminus when PA 147 was realigned onto a new highway. As part of the Central Susquehanna Valley Transportation Project, PA 405 will continue south from its current southern terminus, replacing the stretch of PA 147 until its junction with PA 61 in Sunbury, its new southern terminus. PA 147 will have a new alignment between those two junctions and will not be duplexed with PA 405 at any point.