Lived in NJ until I moved out in 1992. New Jersey is one of the best states for groundhogs hunting!. Every farm / field is crawling with them. Good terrain, lack of coyotes thus far. In many places you can set up on dozens in surrounding fields, shoot, go back in PM and start over.
Good population of red foxes too.
Not many groundhogs in SC / KY where I have lived, live now, claim is made in KY that coyotes have knocked the heck out of them.
Mirage