King's Highway 41, commonly referred to as Highway 41, is a provincially maintained highway in the Canadian province of Ontario.

King's Highway 18, commonly referred to as Highway 18 was the longest highway in Essex County, Ontario, and travelled through the most communities.

Secondary Highway 560, commonly referred to as Highway 560, is a provincially maintained secondary highway in Northern Ontario.

King's Highway 68, commonly referred to as Highway 68, was a provincially maintained highway on Manitoulin Island, linking the island to the mainland.

King's Highway 10, commonly referred to as Highway 10 and historically as the Toronto-Sydenham Road, is a provincially maintained highway in the Canadian province of Ontario.

King's Highway 417, commonly referred to as Highway 417 and the Queensway through Ottawa, is a 400-series highway in the Canadian province of Ontario.

King's Highway 25, commonly referred to as Highway 25, was a highway in the Canadian province of Ontario.

Secondary Highway 638, commonly referred to as Highway 638, is a secondary highway located in the District of Algoma in Ontario.

Secondary Highway 622, commonly referred to as Highway 622, is a long connecting route between Highways 11 and Highway 17 in Northwestern Ontario.

Secondary Highway 529, commonly referred to as Highway 529, is a secondary highway in the Canadian province of Ontario.