Headquarters Library 314 State Route 12, Bldg. #3, Flemington, NJ 08822 Main phone: (908) 788-1444 | North County Branch Library 65 Halstead Street, Clinton, NJ 08809 Main phone: (908) 730-6262 | South County Branch Library 1108 Old York Rd, East Amwell, NJ 08551 Telephone: (908) 968-4611 |