Below is a list of North Plainfield NJ zip codes. For your research we have also included North Plainfield Area Code, Time Zone, UTC and the local Union County FIPS Code. Each North Plainfield New Jersey zip code has a center Longitude / Latitude point (the North Plainfield center is -74.399696350098 / 40.63219833374). For your convenience we have also indicated if that zip code in North Plainfield observes Daylight Savings time.