I'm new here so not sure if its proper etiquette to link other forums to this one, so please do as needed with this post. This is a very nice link for Ghost Towns done state by state. It is pretty detailed and I hope helpful for any who can use.
More specifically if you are in NJ this is another helpful one. This is not a TH site but has many good listings for Ghost Towns / Locations. The main page has quite a bit of interesting material as well, including a forum on GPS locations which I found helpful.