Below is a list of Yankton County SD zip codes. For your research we have also included Yankton County Area Code, Time Zone, UTC and the local County FIPS Code. Each Yankton County South Dakota zip code has a center Longitude / Latitude point (the Yankton County center is -97.36669921875 / 42.95539855957). For your convenience we have also indicated if that zip code in Yankton County observes Daylight Savings time.