Richmond Hill, town, Regional Municipality of York, southern Ontario, on the Little Don, Rouge, and Humber rivers; incorporated 1957. It is a suburb of Toronto and a commercial center for the surrounding agricultural area. Major manufactures include printed materials, building supplies, and metal products. Settled in the early 1790s and known first as Miles Hill and then as Mount Pleasant, the community was renamed Richmond Hill in 1819, probably for a governor-general of Canada, Charles Lennox, 4th duke of Richmond and Lennox. Population 46,766 (1986); 101,725 (1996).
