Town Hall Address 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States- Somerset County Website http://www.rockyhill-nj.gov County Clerk 609-924-7445 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States Assessor 908-722-5554 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States Tax Collector 609-924-7445 Thursday: 5:30 P.M. - 7:30 P.M. 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States Attorney 908-757-7800 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States Mayor 609-924-7445 15 Montgomery Ave. P.O. Box 188 Rocky Hill, NJ 08553 United States Municipal Court 609-924-7943 P.O. Box 212 Rocky Hill, NJ 08553 United States County Somerset