Ontario Highway 42

King's Highway 42, commonly referred to as Highway 42, was a provincially maintained highway in the Canadian province of Ontario. The 52.8-kilometre (32.8 mi)-long route connected Highway 29 at Forthton with the town of Westport, intersecting Highway 15 en route. Highway 42 was assumed in 1935, and aside from paving the partially gravelled road, generally remained unchanged throughout its existence. In 1997, it was decommissioned and transferred to the United Counties of Leeds and Grenville, subsequently being redesignated as Leeds and Grenville County Road 42.