Johnson County, Kansas - Demographics

Demographics

As of the 2010 census, there were 544,179 people, 210,278 households, and 143,509 families residing in the county. The population density was 1,150 people per square mile (365/km2). There were 226,571 housing units at an average density of 381 per square mile (147/km2). The racial makeup of the county was 86.0% White, 4.2% Asian, 4.3% Black or African American, 0.4% Native American, 0.01% Pacific Islander, 1.55% from other races, and 2.5% from two or more races. Hispanic or Latino of any race were 7.2% of the population. 30.6% were of German, 16.8% Irish, 13.6% English and 5.7% American ancestry according to Census 2010.

By 2010 82.0% of Johnson County's population was non-Hispanic whites. 4.3% of the population was African-American. 4.2% were of Asian descent. 0.1% of the population was Native American. 7.2% of the population was Latino.

There were 210,278 households out of which 34.6% had children under the age of 18 living with them, 56.1% were married couples living together, 8.4% had a female householder with no husband present, and 31.8% were non-families. 25.9% of all households were made up of individuals and 7.8% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.05.

In the county the population was spread out with 26.3% under the age of 18, 7.60% from 18 to 24, 32.80% from 25 to 44, 22.50% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 36.4 years. 48.8% of the population are males and 51.2% of the population are females.

The median income for a household in the county was $73,733, and the median income for a family was $90,380. Males had a median income of $61,346 versus $43,785 for females. The per capita income for the county was $37,882. About 3.6% of families and 5.5% of the population were below the poverty line, including 7.1% of those under age 18 and 4.9% of those age 65 or over.