Below is a list of Rocky Hill NJ zip codes. For your research we have also included Rocky Hill Area Code, Time Zone, UTC and the local Somerset County FIPS Code. Each Rocky Hill New Jersey zip code has a center Longitude / Latitude point (the Rocky Hill center is -74.640800476074 / 40.401100158691). For your convenience we have also indicated if that zip code in Rocky Hill observes Daylight Savings time.