Countries: U.S., England, Wales, Scotland, France, Belgium, Switzerland, Italy
States: Florida, Georgia, South Carolina, North Carolina, Virginia, District of Columbia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, Vermont, New Hampshire, Maine, Tennessee, Alabama, Mississippi, Louisiana, Texas, New Mexico, Colorado, Wyoming, Montana, Utah, Arizona, Nevada, California, Illinois, Hawaii
I think that's all, but I'm not 100% sure. I'm also not sure how many of these count as really having been visited, since some of them I've just driven through.
Illinois must feel weird. I have all these states that are connected to each other that I've visited, and then Illinois is all by itself.
I'll start the list of nominees after work, probably.