Town Hall Address 430 Westfield Ave. Clark, NJ 07066-1791 United States- Union County Website https://www.ourclark.com/ County Clerk 732-388-3669 430 Westfield Ave. Clark, NJ 07066-1791 United States County Admin 732-388-3600 430 Westfield Ave. Clark, NJ 07066-1791 United States Assessor 732-388-1943 Monday & Wednesday: 6:00 P.M. - 8:30 P.M. 430 Westfield Ave. Clark, NJ 07066-1791 United States Tax Collector 732-428-8403 430 Westfield Ave. Clark, NJ 07066-1791 United States Attorney 908-709-1700 430 Westfield Ave. Clark, NJ 07066-1791 United States Mayor 732-388-3600 Ext. 3003 430 Westfield Ave. Clark, NJ 07066-1791 United States Municipal Court 732-381-5395 315 Westfield Ave. Clark, NJ 07066-1797 United States County Union