Marion is a city in Turner County, South Dakota, United States. The population was 849 at the 2020 census. Marion was laid out in 1879, …Marion is a city in Turner County, South Dakota, United States. The population was 849 at the 2020 census. Marion was laid out in 1879, and named in honor of a railroad employee's daughter. According to the United States Census Bureau, the city has a total area of 0.87 square miles, all land.
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