2001 Census Results: Same-sex common-law couples
http://www12.statcan.ca/english/census01/products/analytic
/companion/fam/canada.cfm#same_sex_common_law

Gay & Lesbian Consumer Census
(U.S. data - No comparable Canadian figures)
http://www.glcensus.org/

Finally you may find the following Angus Reid Poll results of some interest:

Majority (55%) Agree With Supreme Court Decision that Definition of "Spouse" Apply to Same-sex Couples:
http://www.angusreid.com/media/content/displaypr.cfm?id_to_view=710

Canadian's Views on Including Sexual Orientation in Human Rights Legislation:
http://www.angusreid.com/media/content/displaypr.cfm?id_to_view=631