I have 10 (soon to be 11), but I very seldom tell people that because they wouldn't understand. (Someone once told me that I am a "single woman of a certain age, with too many degrees, too much yarn , and too many cats. So I guess I qualify as that "crazy cat lady".) I figure I have a big enough house for everyone, they are well taken care of (I have a good relationship with my vet), and they don't go outside so no one actually knows how many I have