With respect to Canada
Soccer is the highest participation sport in Canada, with 847,616 registered players (according to the Canada Soccer 2012 Yearbook). Male/female participation is split roughly 59/41 percent. There are 1,456 clubs in 139 districts across 12 regions (provincial and territory member associations). Wiki
And for the USA
Soccer is played by over 13 million people in the U.S., making it the third-most played sport in the U.S., more widely played than ice hockey and football.