9, 10, and 11's are pretty common women's sizes here, especially with younger women. My gf's shoe size is 10-11, depending on the brand. I live with two other women here, and one is 9-10 and the other is also 10-11. I'm 9-10, I usually get 10 'cause I like the comfort. Other women I've dated have been around 9-10, and I know a lot of women are like that around here. Then again, women all seem to be taller around here for some reason, too. *shrugs*