Town Hall Address 1409 Liberty Ave. Hillside, NJ 07205 United States- Union County Website http://www.hillsidenj.us County Clerk 973-681-7155 1409 Liberty Ave. Hillside, NJ 07205 United States Assessor 973-926-2222 1409 Liberty Ave. Hillside, NJ 07205 United States Tax Collector 973-926-5502 1409 Liberty Ave. Hillside, NJ 07205 United States Attorney 973-926-3002 Ext. 307 1409 Liberty Ave. Hillside, NJ 07205 United States Mayor 973-926-3002 Ext. 308 1409 Liberty Ave. Hillside, NJ 07205 United States Municipal Court 973-926-1881 1409 Liberty Ave. Hillside, NJ 07205 United States Town Hall Hours Monday - Friday: 9:00 A.M. - 4:00 P.M. County Union