oh god....
From college: roommate, best buddy, housemate, friend's bf, another two roommates. And those are the ones that are confirmed. I went to an engineering school. The sociology professor has Proved that we have an abnormally high % of INTPs.
From high school: best friend, prom date, friend. There are a couple others that are suspicious, like they might be INTP, but I don't know enough.
From my neighborhood: A childhood friend who lives 3 houses down, is totally INTP.
My girlfriend is also INTP.
Family:
Dad, Uncle, cousin (? maybe INTJ), cousin's husband. Another cousin's husband. Maybe my Aunt. Maybe another cousin.
I just came back from a trip to Seattle, where I interviewed for a job and looked at a house with a room for rent. I think 3+ of the people in the research lab are INTPs, or at least INTJ. Two people at the house were totally INTP.
That brings it to: 15 confirmed. (I'm not counting the people I just met in Seattle.) Probably more.
I think I know so many INTPs because I've learned how to identify them. Even before I knew INTPs, I knew I liked smart people who like to muse about ideas.
I wouldn't count myself, because I don't know myself.