Vincent,
I don't know anything about this, but am sticking my two cents in anyway so that you don't have to wait for "anonymous" to return in case you want to try to help answer the question.
I would expect the county is in West Virginia, which is where the Hatfields lived ... then again, I could be wrong and it's possible the Hatfields spilled over into western Virginia or maybe even northwestern Maryland or southwestern Pennsylvania ... maybe even northeastern Tennesee.