Town Hall Address 2480 Plainfield Ave. South Plainfield, NJ 07080 United States- Middlesex County Website http://www.southplainfieldnj.com County Clerk 908-226-7606 2480 Plainfield Ave. South Plainfield, NJ 07080 United States County Admin 908-226-7602 South Plainfield, NJ 07080 United States Assessor 908-226-7622 2480 Plainfield Ave. South Plainfield, NJ 07080 United States Tax Collector 908-226-7613 2480 Plainfield Ave. South Plainfield, NJ 07080 United States Attorney 908-757-7800 2480 Plainfield Ave. South Plainfield, NJ 07080 United States Mayor 908-226-7601 2480 Plainfield Ave. South Plainfield, NJ 07080 United States Municipal Court 908-226-7651 2480 Plainfield Ave. South Plainfield, NJ 07080 United States County Middlesex