GMAT is only one component of your academic profile (along with quality of undergraduate institution, degree, and major, GPA, etc.) and academic profile is only one component of your overall candidacy (along with professional, community and personal dimensions). That said take a look at Richard Ivey School of Business, University of Toronto, York University, University of British Columbia, McGill and University of Alberta.
Richard Ivey School of Business has an average GMAT of 669; University of Toronto has an average GMAT of 673; University of Toronto has an average GMAT of 660; York University has an average GMAT of 650; University of British Columbia has an average GMAT score of 646; McGill has an average GMAT score of 670; and University of Alberta has an average GMAT score around your score at 620.
Good luck,