Incidentally I’d be happy to give anyone a spreadsheet of around 150 casinos with restrictions in place in return for a link on each site you use it. I won’t guarantee the info, but I’m pretty confident it’s accurate so email me [email protected] if you want it.
It has 3 columns: casino, a Y/N column indicating if they take US players and a State Restrictions column. Quite simple to use with a PHP script or simply as a manual lookup.