Below is a list of Smithtown NY zip codes. For your research we have also included Smithtown Area Code, Time Zone, UTC and the local Suffolk County FIPS Code. Each Smithtown New York zip code has a center Longitude / Latitude point (the Smithtown center is -73.20369720459 / 40.856601715088). For your convenience we have also indicated if that zip code in Smithtown observes Daylight Savings time.