I live in Toronto and belong to the Grange in Gormley. It is located off the 404 north of Richmond Hill. It is a very good facility but the membership is not cheap - $550/year. It is attached to Target Sports, a sponsor here. You will find that other gun clubs in Toronto only have the use of a range a couple of days/week and becoming a member is a pain in the ass. The Grange is a no-nonsense type of club. You take the range safety course, pay your dues and you're in.
http://www.grangesports.org/index.html