Below is a list of Holtsville NY zip codes. For your research we have also included Holtsville Area Code, Time Zone, UTC and the local Suffolk County FIPS Code. Each Holtsville New York zip code has a center Longitude / Latitude point (the Holtsville center is -73.044403076172 / 40.812599182129). For your convenience we have also indicated if that zip code in Holtsville observes Daylight Savings time.