My daughter just played 1st match of season yesterday (she's #9 and scored 3 tries in 30-0 romp of another local high school in Buffalo, NY region). Her HS has 29 girls on Women's Varsity and around the same number of guys on Men's Varsity. There's quite a large HS tournament coming up in 2 weeks in Columbus, Ohio. Their webpage is
http://www.ohiorugbyclassic.org/aboutoyr.asp