Garretson is a city in Minnehaha County, South Dakota, United States. The city had a population of 1,228 at the 2020 census. The city has the name of A. S. Garretson, a local banker. According to the United States Census Bureau, the city has a total area of 1.49 square miles, of which 1.45 square miles is land and 0.04 square miles is water.
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