Ontario Highway 4

King's Highway 4, also known as Highway 4, is a provincial highway in Ontario, Canada. It starts at Highway 3 in Southwold. It then continues northward until ending at Highway 8 in Clinton. It is 100.8 kilometers (62.6 miles) long. The highway passes through Elgin County, Middlesex County, and Huron County. It also passes through the major cities of St. Thomas and London.

290px 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
Major intersections	Highway 401 Highway 402 File:Ontario 7.svg Highway 7
North end	File:Ontario 8.svg Highway 8 – Clinton
Highway system
Ontario provincial highways Current Former 400-series
← →
Former provincial highways ←     →

Ontario Highway 4 Media

• Highway4StThomas.JPG

  The Highway 4 / Talbot Street junction in St. Thomas

• Highway4Lambeth.JPG

  Former alignment of Highway 4 looking north towards Lambeth from the Highway 402 interchange in London