I just stumbled across this forum, and you may have already found the answer to your question. However, just in case you haven't, I'll tell you that there is a school for the Deaf in Trenton. It's called the Marie Katzenbach school and it's been there since the 1800s.
I grew up in South Jersey and was an Interpreting for the Deaf major in college. Although I never visited that school, (I went to college out of state), I was always aware of its existance.