Below is a list of Middlesex NJ zip codes. For your research we have also included Middlesex Area Code, Time Zone, UTC and the local Middlesex County FIPS Code. Each Middlesex New Jersey zip code has a center Longitude / Latitude point (the Middlesex center is -74.500099182129 / 40.571899414062). For your convenience we have also indicated if that zip code in Middlesex observes Daylight Savings time.