The province of Quebec, Canada has a new area code starting August 21, 2010. The new NPA is 579 and will cover the same area served by area code 450: Joliette, Longueuil, Pont-Viau, St. Jerome, St. Lambert…. Test numbers were activated June 19, 2010 and will be discontinued October 21, 2010. 10 digit local dialing is mandatory starting August 21.
See NANPA announcement and map for the new overlay complex 450/579 (in PDF format)