I’m not sure anyone can compile a true list, but I can give you anecdotal evidence. I live in Maine, population 1.2 million. I’ve only been lifting for about 5 years, mostly as a hobbyist/gym rat, never as a competitor. Let’s run down the list of people in and around my little circle…
I personally know one guy who definitely could have done that, and might still be able to even though he’s on the wrong side of 40 and doesn’t train the bench very much or compete anymore. I’ve seen him rep 405 for 10 in the last year, which I’d think has him in the ballpark. His best meet lift that I found online was 672 multi-ply, but I think I recall him saying he’s benched over 700. He trained at Westside.
Another guy popped into a jiu jitsu training session I was at and I found a video of him benching 650 in a multi-ply meet. I’m not sure if that puts him at 500 raw, but he’s gotta be close. I’m hoping to cross paths again and do a little rolling with that beast…
I know a friend of a friend definitely can right now, and he is an active raw powerlifting competitor about an hour south of me. He has also trained at Westside.
The one guy who I know for certain can do this in a meet already makes the state disproportionately represented in a country with (according to you) only 100 people who can do it. If I’m right about the other two we’re off the charts strong. Perhaps Maine is just home to a disproportionate number of very strong people that happen to be in or very close to the very small circle of lifters I actually know in person, but I doubt that’s the case.
So, in summary, your entire premise doesn’t pass my smell test.
Oh, and I almost forgot about Tony Atlas, former pro wrestler who lives and trains in my area. I don’t think he can bench 500 now, but I know he used to be able to and I think he can still take 405 for a ride. I ran into him once. Still a really big dude.