Ontario Highway 404

Highway 404
Highway 404 highlighted in red
Route information
Length:	50.1 km (31.1 mi)
Existed:	1977 – present
Major junctions
South end:	Highway 401 /  Don Valley Parkway – Toronto
	Highway 407 – Markham  Regional Road 7 (Highway 7) – Richmond Hill, Markham
North end:	Regional Road 8 (Woodbine Avenue) – East Gwillimbury
Highway system
Ontario provincial highways List 400-series Former ← Highway 403 Highway 405 →

King's Highway 404 (pronounced "four-oh-four"), also known as Highway 404 and colloquially as the 404, is a 400-series highway in the Canadian province of Ontario connecting Highway 401 and the Don Valley Parkway (DVP) in Toronto with East Gwillimbury. The 50.1-kilometre (31.1 mi) controlled-access highway also connects with Highway 407 in Markham. Highway 404 provides access to the eastern edge of Richmond Hill, Aurora and Newmarket and the western edge of Whitchurch-Stouffville, in addition to the southern edge of Keswick.

Construction on the freeway began soon after the completion of the Don Valley Parkway, with the first section south of Steeles Avenue opening in 1977. Over the next twelve years, the Ministry of Transportation of Ontario (MTO) undertook a continuous construction program to build the freeway to Davis Drive in Newmarket. This was completed on October 24, 1989. The route has undergone a periodic series of smaller extensions and widening in the years since, now travelling a further 15.5 km (9.6 mi) north to Woodbine Avenue near Ravenshoe Road in the town of East Gwillimbury. Future proposals may one day result in an extension to southeast of Beaverton.