Highway 400
Toronto–Barrie Highway[1]
Route information
Maintained by Ministry of Transportation of Ontario
Length	226 km[2] (140 mi)
History	Opened December 1, 1951 – July 1, 1952[3]
Major junctions
South end	Maple Leaf Drive – Toronto (continues as Black Creek Drive)
Major intersections	Highway 401 – Toronto  Highway 407 – Vaughan  Highway 11 – Barrie  Highway 12 – Waubaushene  Highway 124 – Parry Sound
North end	Highway 69 in Carling
Location
Country	Canada
Province	Ontario
Major cities	Toronto Barrie Sudbury (future)
Towns	Parry Sound, Bradford, King
Highway system
Ontario provincial highways Current Former 400-series
← Highway 169 Highway 401 →

Ontario Highway 400, also called King's Highway 400, is a provincial highway in Ontario, Canada. It runs mostly north and south and is 226 kilometers (140 miles) long. It goes between Toronto and Carling.

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