Ontario Highway 4

Highway 4
Location of Highway 4 in Southern Ontario      Current route      Former route
Route information
Length:	100.8 km (62.6 mi)
Existed:	February 26, 1920 – present
Major junctions
South end:	Highway 3 – St. Thomas
	Highway 401  Highway 402  Highway 7
North end:	Highway 8 – Clinton
Location
Major cities:	St. Thomas, London
Towns:	Exeter, Clinton
Highway system
Ontario provincial highways List 400-series Former ←  Highway 3   Highway 5  →

King's Highway 4, also known as Highway 4, is a provincially maintained highway in the Canadian province of Ontario. Originally much longer than its present 100.8 km (62.6 mi) length, more than half of Highway 4 was transferred to the responsibility of local governments in 1998. In its present form, it travels between Highway 3 in Talbotville Royal, north-west of St. Thomas, and Highway 8 in Clinton.

Highway 4 was first designated in 1920, when a 27 km (17 mi) route between Talbotville Royal and Elginfield was assumed by the Department of Highways. Over the next half century it was extended north and east to Highway 24 near Singhampton, and south to Port Stanley.

In its present form, Highway 4 travels through Talbotville Royal, Tempo, Scottsville, Lambeth, London, Northcrest, Uplands, Arva, Birr, Elginfield, Lucan, Clandeboye, Mooresville, Centralia, Exeter, Hay, Hensall, Kippen, Brucefield, Vanastra, and Clinton.