Johnson County is a county located in the U.S. state of Arkansas originally created from a portion of Pope County. As of 2000, the population was 22,781. The county seat is Clarksville. Johnson County is Arkansas's 30th county, formed on November 16, 1833 and named for Ben Johnson, a Territorial Judge. It is an alcohol prohibition or dry county.
As of the census of 2000, there were 22,781 people, 8,738 households, and 6,238 families residing in the county. The population density was 34 people per square mile (13/km²). There were 9,926 housing units at an average density of 15 per square mile (6/km²). The racial makeup of the county was 93.69% White, 1.37% Black or African American, 0.62% Native American, 0.25% Asian, 0.01% Pacific Islander, 2.62% from other races, and 1.43% from two or more races. 6.70% of the population were Hispanic or Latino of any race.
There were 8,738 households out of which 32.40% had children under the age of 18 living with them, 58.10% were married couples living together, 9.50% had a female householder with no husband present, and 28.60% were non-families. 24.60% of all households were made up of individuals and 11.60% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.01.
In the county the population was spread out with 25.20% under the age of 18, 9.70% from 18 to 24, 27.60% from 25 to 44, 22.70% from 45 to 64, and 14.80% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 99.00 males. For every 100 females age 18 and over, there were 95.40 males.
The median income for a household in the county was $27,910, and the median income for a family was $33,630. Males had a median income of $25,779 versus $19,924 for females. The per capita income for the county was $15,097. About 12.90% of families and 16.40% of the population were below the poverty line, including 19.60% of those under age 18 and 15.30% of those age 65 or over.