Below is a list of Watchung NJ zip codes. For your research we have also included Watchung Area Code, Time Zone, UTC and the local Somerset County FIPS Code. Each Watchung New Jersey zip code has a center Longitude / Latitude point (the Watchung center is -74.440803527832 / 40.645301818848). For your convenience we have also indicated if that zip code in Watchung observes Daylight Savings time.