Pennsylvania Route 405

Pennsylvania Route 405
Major highways in the Williamsport area with PA 405 in red
Route information
Maintained by PennDOT
Length	35.124 mi[1] (56.527 km)
Existed	1941[2]–present
Major junctions
South end	PA 61 in Sunbury
Major intersections	US 11 in Northumberland PA 45 in West Chillisquaque Township PA 642 in Milton PA 254 in Milton PA 44 in Watsontown PA 54 in Montgomery I-180 in Muncy PA 442 in Muncy Creek Township PA 118 in Hughesville
North end	US 220 in Hughesville
Location
Country	United States
State	Pennsylvania
Counties	Northumberland, Lycoming
Highway system
Pennsylvania State Route System Interstate US State Scenic Legislative
← PA 404 → PA 407

Pennsylvania Route 405 (PA 405) is a 35.124-mile-long (56.527 km) state highway that runs in the north-central part of the U.S. state of Pennsylvania. The southern terminus is an intersection with PA 61 in Sunbury. The route heads across the Susquehanna River to Northumberland and 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 south to PA 147 in Chillisquaque when PA 147 was realigned onto a new highway. As part of the Central Susquehanna Valley Thruway project, PA 405 was extended further south, replacing the stretch of PA 147 until its junction with PA 61 in Sunbury, its new southern terminus. PA 147 was moved to a new alignment between those two junctions.