Town Hall Address 512 Springfield Ave. Summit, NJ 07901-2667 United States- Union County Website http://www.cityofsummit.org County Clerk 908-273-6400 512 Springfield Ave. Summit, NJ 07901-2667 United States County Admin 908-522-3600 Summit, NJ 07901-2667 United States Assessor 908-273-6405 512 Springfield Ave. Summit, NJ 07901-2667 United States Tax Collector 908-273-6403 512 Springfield Ave. Summit, NJ 07901-2667 United States County Union