Town Hall Address 419 Howard Blvd. Mount Arlington, NJ 07856 United States- Morris County Website http://www.mountarlingtonnj.org County Clerk 973-398-6832 Ext. 112 419 Howard Blvd. Mount Arlington, NJ 07856 United States Assessor 973-398-6832 Ext. 123 Monday: 1:00 P.M. - 8:00 P.M. 419 Howard Blvd. Mount Arlington, NJ 07856 United States Tax Collector 973-398-6832 Ext. 113 419 Howard Blvd. Mount Arlington, NJ 07856 United States Attorney 973-538-1230 419 Howard Blvd. Mount Arlington, NJ 07856 United States Mayor 973-398-6832 Ext. 4 419 Howard Blvd. Mount Arlington, NJ 07856 United States Municipal Court 973-398-6832 Ext. 130 419 Howard Blvd. Mount Arlington, NJ 07856 United States County Morris