Charles Mix County
There are 5 US Post Offices in Charles Mix County serving a total of 8,726 residents equating to 1,745 residents per post office. It's estimated that approximately 13,928 packages are handled across the 5 county post offices annually. Charles Mix County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 9,129. Its county seat is Lake Andes. The county was created in 1862 and organized in 1879. It was named after Charles Eli Mix, an official of the Bureau of Indian Affairs influential in signing a peace treaty with the local Lakota Indian tribes. The easternmost approximately 60% of the county comprises the Yankton Indian Reservation."