AreaVibes reveals the best places to live in South Dakota for 2016 using our Livability Score. The Livability Score for each city in South Dakota is calculated out of 100 from a unique algorithm based on various metrics, including: amenities, cost of living, crime, education, employment, housing and weather. South Dakota has a population of 815,871 and a population density of 10.8 people per square mile. The capital city is Pierre and the largest city in South Dakota is Sioux Falls. To filter the results, use the dropdown options to sort by population or category.