South Dakota is located in the heart of the United States. The state is split into 66 counties, each with its own set of leaders and services catering to its residents. These counties vary in terms of their size, population, and landscape. Minnehaha, Meade, Pennington, and Clay are among the most densely populated areas. Let’s explore the five counties that have experienced the highest population decline since 2010, as reported by the World Population Review.