South Dakota is a U.S. state situated in the Upper Midwest region of the United States. Pierre is the capital and Sioux Falls is the largest city of South Dakota. Mount Rushmore State is the nickname of South Dakota. South Dakota Zip Code started with the digit 5700. The total number of South Dakota Zip Code approximately 385. The total population of South Dakota about 884,659. So you can find any information about South Dakota especially zip codes, area codes, Populations, cities, county and so on.