Town Hall Address 531 Speedwell Ave. Morris Plains, NJ 07950 United States- Morris County Website http://www.morrisplainsboro.org County Clerk 973-538-2224 531 Speedwell Ave. Morris Plains, NJ 07950 United States Assessor 973-538-2444 531 Speedwell Ave. Morris Plains, NJ 07950 United States Tax Collector 973-538-2444 531 Speedwell Ave. Morris Plains, NJ 07950 United States Attorney 973-895-7550 1247 Sussex Tpk. Randolph, NJ 07869 United States Municipal Court 973-538-4019 531 Speedwell Ave. Morris Plains, NJ 07950 United States County Morris