Town Hall Address 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States- Middlesex County Website https://www.middlesexboro-nj.gov/ County Clerk 732-356-7400 Ext. 236 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States County Admin 732-356-7400 Ext. 264 Middlesex, NJ 08846-2700 United States Assessor 732-356-7400 Ext. 270 Wednesday: 10:00 A.M. - 2:00 P.M. 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States Tax Collector 732-356-7400 Ext. 242 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States Attorney 732-752-3100 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States Mayor 732-356-7400 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States Municipal Court 732-356-4644 1200 Mountain Ave. Middlesex, NJ 08846-2700 United States County Middlesex