Industrialization of agriculture and the attraction of urban areas have contributed to the decline in population of Kingsbury County, similar to what has occurred in other Plains rural areas. In 2010 it had less than half the population of its peak in 1930, before the
Dust Bowl and the
Great Depression.
2020 census As of the
2020 census, there were 5,187 people, 2,191 households, and 1,398 families residing in the county; the
population density was . There were 2,615 housing units. Of the residents, 22.9% were under the age of 18 and 24.3% were 65 years of age or older; the median age was 44.8 years. For every 100 females there were 104.6 males, and for every 100 females age 18 and over there were 104.6 males. There were 2,191 households, of which 24.1% had children under the age of 18 living with them and 19.6% had a female householder with no spouse or partner present. About 31.9% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older. Among the 2,615 housing units, 16.2% were vacant. Among occupied housing units, 77.4% were owner-occupied and 22.6% were renter-occupied. The homeowner vacancy rate was 1.2% and the rental vacancy rate was 7.5%.
2010 census As of the
2010 census, there were 5,148 people, 2,222 households, and 1,418 families in the county. The population density was . There were 2,720 housing units at an average density of . The racial makeup of the county was 98.1% white, 0.5% American Indian, 0.3% Asian, 0.1% black or African American, 0.3% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 1.4% of the population. In terms of European ancestry, 42.8% were
German, 25.5% were
Norwegian, 10.9% were
Danish, 9.6% were
Irish, 7.2% were
English, and 3.5% were
American. Of the 2,222 households, 24.3% had children under the age of 18 living with them, 55.6% were married couples living together, 5.0% had a female householder with no husband present, 36.2% were non-families, and 32.2% of all households were made up of individuals. The average household size was 2.23 and the average family size was 2.81. The median age was 47.1 years. The median income for a household in the county was $44,948 and the median income for a family was $56,925. Males had a median income of $35,585 versus $28,141 for females. The per capita income for the county was $24,660. About 7.0% of families and 9.2% of the population were below the
poverty line, including 8.8% of those under age 18 and 10.8% of those age 65 or over. ==Communities==