Charles Mix County Post Offices

312 Main Ave
Geddes, South Dakota 57342

499 Main St
Lake Andes, South Dakota 57356

106 Lewis Ave
Pickstown, South Dakota 57367

20 E 5th St
Platte, South Dakota 57369

109 2nd St SE
Wagner, South Dakota 57380

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."