I noticed in my Overstreet book that KY does have some exceptional grade artifacts for the Eastern Central region. However, there is a list of the important sites in that region and a site from KY is not listed at all. All the important sites listed are from TN or AL. I think you best answer would be to look at each region. Split up the U.S. by east, central, and west. I still think that would be difficult b/c many of those high end types can still overlap, just as Jamey said. I think any state in the U.S. would be equal too. The chances probably could be less in a smaller state like RI but the finest, most expensive artifact ever found could be from there. What would you think about your chances would be in Hawaii or Alaska? Lol. You could find an artifact from the Paleo-Arctic cultures in Alaska. I'm not sure about Hawaii....anyone here found anything in Hawaii before? What would be the toughest state to look for artifacts?