Tennessee for sure, but I believe I've seen reports from New York though those may have been "farmed" Europiggies.

Out West, we have them clear up to the Olympic Penninsula.

I've heard reports of hogs near Gays Mills, Wisconsin but in a trip there last fall I could not find any locals that could confirm this. I would guess they are feral if they exist. I know there are some running around in S. Illinois and the state wants them gone. They cause problems with the domestic hog farmers.