Town Hall Address 137 Main St. Andover, NJ 07821 United States- Sussex County Website http://www.andoverboroughnj.org County Clerk 973-786-6688 137 Main St. Andover, NJ 07821 United States Assessor 973-786-6688 137 Main St. Andover, NJ 07821 United States Tax Collector 973-786-6688 137 Main St. Andover, NJ 07821 United States Attorney 973-383-1200 137 Main St. Andover, NJ 07821 United States Mayor 973-383-1200 137 Main St. Andover, NJ 07821 United States Municipal Court 973-383-4280 Ext. 4 134 Newton-Sparta Rd. Newton, NJ 07860 United States County Sussex