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Ottumwa is an unincorporated community in Haakon County, in the U.S. state of South Dakota.
History
A post office called Ottumwa was established in 1904, and remained in operation until 1983. The community takes its name from Ottumwa, Iowa, the native home of a share of the early settlers.
References
Ottumwa, South Dakota Wikipedia(Text) CC BY-SA