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BTW I searched for variations of USA or United States. That will miss all those people who just have their state or city in the profile, so there will be a lot more. I'm not aware of anyone doing a comprehensive US version of my BritList.

That's a good point. A lot of people put nothing or something more whimsical too.

A lot of people on the BritList do not have a real location, but I found them by other means. It needs some manual effort.