Here's all the states I've ever visited. (OK, so I'm counting Georgia and Florida on a technicality; I was in the Atlanta and Miami airports catching continuing flights to other destinations. But still, I was "on the ground" - er, airport floor, as it were - for an hour or two.)
I'm not sure why I've never been in Oregon - I was 12 miles from the border once; I don't recall why we didn't just continue and at least set foot in the state. Ditto Vermont.