Town Hall Address 125 Virginia Ave. Williamstown, NJ 08094-9411 United States- Gloucester County Website http://www.monroetownshipnj.org County Clerk 856-728-9800 Ext. 217 125 Virginia Ave. Williamstown, NJ 08094-9411 United States County Admin 856-728-9800 Ext. 204 Williamstown, NJ 08094-9411 United States County Manager 856-728-9800 Ext. 204 125 Virginia Ave. Williamstown, NJ 08094-9411 United States Assessor 856-307-6445 1200 N. Delsea Dr. Clayton, NJ 08312 United States Tax Collector 856-728-9800 Ext. 285 125 Virginia Ave. Williamstown, NJ 08094-9411 United States Attorney 856-853-5330 125 Virginia Ave. Williamstown, NJ 08094-9411 United States Mayor 856-728-9800 Ext. 201 125 Virginia Ave. Williamstown, NJ 08094-9411 United States Municipal Court 856-728-9800 Ext. 500 125 Virginia Ave. Williamstown, NJ 08094-9411 United States County Gloucester