There were 564 households, out of which 34.9% had children under the age of 18 living with them, 47.0% were married couples living together in Mansfield, Mo 12.1% had a female householder with no husband present 37.1% were classified as "non-families" (a U.S. census term for one individual living alone, or a group of individuals who are not all related by blood, marriage, or adoption). 34.9% of all households were made up of individuals, and 21.1% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 3.07.