I haven't been in many countries, although I've been in a few more than once:
The states was a tough one, because my family did a lot of US travel (mostly by car) when I was a kid, and I had to remember all the trips and all the routes. Total: 35.
Then I could only remember 47 states! That may sound funny, but try to list all 50 off the top of your head, without looking at a map. It's not so easy! Finally there were 49 on the list... I could see the shape of that last one in my head, but just couldn't remember what it was. Poor Oklahoma. And I grew up hearing Rodgers & Hammerstein musicals, too!
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Using the link David supplied, here are my visited US states and visited countries.