Just to be clear, I am male.
College, where I was a player, the group was 50/50 men and women.
My Living Greyhawk group (2001-2005) where I was the primary judge I had 3 core female players and 1 male core player. We would usually fill the two other guest slots at the table with 2 men. Sometimes a woman and a man.
So I would have anywhere from 75% women, if only my core group showed up, to 50% if both guest slots where filled by men.
I was a player in a Forgotten Realms campaign (2006) with 9 players, 3 of whom where women... 33%.
My current group (home Greyhawk campaign) I am judging is 8 players, 3 of whom are women... so I am at 37% women (the lowest percentage I have regularly judged in a long while).
There are many female players in the Portland, OR area and most venues are open to them participating. When I ran the RPGA gaming at Gamestorm 2006 I had 5 female judges (out of a pool of 20, and way more female players. Granted the men out numbered the women by about 65%. I still consider having a 35% female attendance rate at a convention to be excellent.
My two coppers,
Bryan Blumklotz
AKA Saracenus