Town Hall Address 221 S. Fifth Ave. Highland Park, NJ 08904 United States- Middlesex County Website http://www.hpboro.com County Clerk 732-777-6014 221 S. Fifth Ave. Highland Park, NJ 08904 United States Assessor 732-819-3783 221 S. Fifth Ave. Highland Park, NJ 08904 United States Tax Collector 732-819-3787 221 S. Fifth Ave. Highland Park, NJ 08904 United States Attorney 609-436-1200 101 Poor Farm Rd. Princeton, NJ 08540 United States Mayor 732-777-6000 101 Poor Farm Rd. Princeton, NJ 08540 United States Municipal Court 732-777-6010 101 Poor Farm Rd. Princeton, NJ 08540 United States County Middlesex