2020 census As of the
2020 census, the county had a population of 13,086. The median age was 46.1 years. 20.3% of residents were under the age of 18 and 23.5% of residents were 65 years of age or older. For every 100 females there were 98.0 males, and for every 100 females age 18 and over there were 97.4 males age 18 and over. The racial makeup of the county was 94.9%
White, 0.4%
Black or African American, 0.2%
American Indian and Alaska Native, 0.2%
Asian, <0.1%
Native Hawaiian and
Pacific Islander, 0.3% from some other race, and 3.9% from
two or more races.
Hispanic or Latino residents of any race comprised 1.4% of the population. <0.1% of residents lived in urban areas, while 100.0% lived in rural areas. There were 5,657 households in the county, of which 25.2% had children under the age of 18 living in them. Of all households, 46.9% were married-couple households, 19.6% were households with a male householder and no spouse or partner present, and 24.9% were households with a female householder and no spouse or partner present. About 31.8% of all households were made up of individuals and 15.7% had someone living alone who was 65 years of age or older. The population density was . There were 7,077 housing units at an average density of . The racial makeup of the county was 98.1% white, 0.4% black or African American, 0.3% Asian, 0.2% American Indian, 0.1% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population. Of the 6,079 households, 28.9% had children under the age of 18 living with them, 52.1% were married couples living together, 10.3% had a female householder with no husband present, 33.2% were non-families, and 28.4% of all households were made up of individuals. The average household size was 2.38 and the average family size was 2.87. The median age was 44.0 years. Mason County was identified as a “sundown” county which “has remained all white for many decades, despite its location between Springfield and Peoria...”. ==Communities==