Below is a list of Iselin NJ zip codes. For your research we have also included Iselin Area Code, Time Zone, UTC and the local Middlesex County FIPS Code. Each Iselin New Jersey zip code has a center Longitude / Latitude point (the Iselin center is -74.314498901367 / 40.572101593018). For your convenience we have also indicated if that zip code in Iselin observes Daylight Savings time.