Millhousen is a town in Marion Township, Decatur County, Indiana, United States. The population was 149 at the 2020 census. Millhousen is perhaps best known for being the home of the Immaculate Conception Church, one of only four Roman Catholic churches in Decatur County, and Stone's Family Restaurant, one of the best known restaurants in Decatur County. History Millhousen was platted in 1858, having been settled by a colony of German Catholics. It was named for a town of the same name in Germany. Geography Millhousen is located at (39.210931, -85.433678). According to the 2010 census, Millhousen has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 127 people, 52 households, and 31 families living in the town. The population density was . There were 60 housing units at an average density of . The racial makeup of the town was 99.2% White and 0.8% from two or more races. There were 52 households, of which 32.7% had children under the age of 18 living with them, 48.1% were married couples living together, 5.8% had a female householder with no husband present, 5.8% had a male householder with no wife present, and 40.4% were non-families. 36.5% of all households were made up of individuals, and 17.3% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 3.10. The median age in the town was 32.9 years. 28.3% of residents were under the age of 18; 5.6% were between the ages of 18 and 24; 31.5% were from 25 to 44; 22.9% were from 45 to 64; and 11.8% were 65 years of age or older. The gender makeup of the town was 49.6% male and 50.4% female. 2000 census As of the census of 2000, there were 136 people, 55 households, and 38 families living in the town. The population density was . There were 63 housing units at an average density of . The racial makeup of the town was 100.00% White. There were 55 households, out of which 30.9% had children under the age of 18 living with them, 60.0% were married couples living together, 3.6% had a female householder with no husband present, and 29.1% were non-families. 25.5% of all households were made up of individuals, and 20.0% had someone living alone who was