Marion Mills, IndianaMarion Mills is an unincorporated community in Marion [Township, Owen County, Indiana|Marion Township], Owen County, in the U.S. state of Indiana.HistoryAn old variant name of the community was called Hausertown. A post office was established under the Hausertown name in 1838, and remained in operation until it was discontinued in 1907. The community's present name was taken from Marion Township.GeographyMarion Mills is located at.