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2010 Census figures for Johnson County
As of the census of 2010, there were 23,356 people, 9,329 households, and //// families residing in the county. The population density was 89.2 /sqmi. There were 10,474 housing units at an average density of 39 /sqmi//////. The racial makeup of the county was 98.2% White, 0.4% Black or African American, 0.1% Native American, 0.4% Asian, 0.0% Pacific Islander, 0.1% from other races, and 0.8% from two or more races. 0.6% of the population were Hispanic or Latino of any race.

There were 9,329 households out of which 28.1% had children under the age of 18 living with them, 54.3% were married couples living together, 11.5% had a female householder with no husband present, and 29.5% were non-families. 26.2% of all households were made up of individuals and 11.8% 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 2.92.

In the county the population was spread out with 22.4% under the age of 18, 8.80%//// from 18 to 24, 28.90%///// from 25 to 44, 25.70%//// from 45 to 64, and 15.5% who were 65 years of age or older. The median age was 40.4 years. For every 100 females there were 93.10//// males. For every 100 females age 18 and over, there were 90.70//// males.

The median income for a household in the county was $34,466, and the median income for a family was $41,894. Males had a median income of $29,762//// versus $20,136//// for females. The per capita income for the county was $19,358. About 17.8%//// of families and 22.6% of the population were below the poverty line, including 31.0% of those under age 18 and 14.3% of those age 65 or over.{{cite web
 * url= http://quickfacts.census.gov/qfd/states/21/21115.html
 * title= Johnson County QuickFacts from the US Census Bureau
 * accessdate= 2007-06-06
 * author= US Census Bureau