Below is a list of Hackettstown NJ zip codes. For your research we have also included Hackettstown Area Code, Time Zone, UTC and the local Warren County FIPS Code. Each Hackettstown New Jersey zip code has a center Longitude / Latitude point (the Hackettstown center is -74.829299926758 / 40.853801727295). For your convenience we have also indicated if that zip code in Hackettstown observes Daylight Savings time.