Town Hall Address 215 Stiger St. Hackettstown, NJ 07840 United States- Warren County Website http://www.hackettstown.net County Clerk 908-852-3130 215 Stiger St. Hackettstown, NJ 07840 United States Assessor 908-852-6767 Monday: 9:00 A.M. - 12:00 P.M., Wednesday & Friday: 12:00 P.M. - 5:00 P.M. 215 Stiger St. Hackettstown, NJ 07840 United States Tax Collector 908-852-3130 215 Stiger St. Hackettstown, NJ 07840 United States Attorney 908-852-3130 215 Stiger St. Hackettstown, NJ 07840 United States Mayor 908-852-3130 215 Stiger St. Hackettstown, NJ 07840 United States Municipal Court 908-852-0688 215 Stiger St. Hackettstown, NJ 07840 United States County Warren