Ontario Highway 4

Highway 4
A map of Highway 4   Highway 4   Connecting Links   Sections downloaded in 1998
Route information
Maintained by Ministry of Transportation of Ontario
Length	100.8 km[1] (62.6 mi)
Existed	June 24, 1920[2]–present
Major junctions
South end	Highway 3 – St. Thomas
Major intersections	Highway 401  Highway 402  Highway 7
North end	Highway 8 – Clinton
Location
Country	Canada
Province	Ontario
Major cities	St. Thomas, London
Towns	Exeter, Clinton
Highway system
Ontario provincial highways Current Former 400-series
← Highway 3 → Highway 5
Former provincial highways ←  Highway 3B Highway 4A  →

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. It travels between Highway 3 in Talbotville Royal, north-west of St. Thomas, and Highway 8 in Clinton, passing through the city of London inbetween.

Highway 4 was first designated in 1920, when a 51-kilometre (32 mi) route between Talbotville Royal and Elginfield was assumed by the Department of Highways. It was extended in the early 1930s both south to Port Stanley as well as north to Flesherton.