Below is a list of Mellette County SD zip codes. For your research we have also included Mellette County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mellette County South Dakota zip code has a center Longitude / Latitude point (the Mellette County center is -100.74500274658 / 43.534301757812). For your convenience we have also indicated if that zip code in Mellette County observes Daylight Savings time.