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If you're talking pure or nearly-pure Russian wild boars, there aren't many in most parts of the country. Feral hogs and cross-breeds, mostly the feral domestic versions which can be very nasty, are all over the U.S. and are just as destructive and dangerous. I remember hearing some time back that the eastern part of Kentucky especially has had a lot of hog problems. The place to start is with the Department of Fish & Wildlife Resources, online or at your nearest DFWR office.