Gardner is a city in Johnson County, Kansas, United States. As of the 2010 census, the city population was 19,123. It is located in the Kansas City metropolitan area.
Gardner is located at 38°48′45″N 94°55′7″W / 38.81250°N 94.91861°W / 38.81250; -94.91861 (38.812367, -94.918621). According to the United States Census Bureau, the city has a total area of 10.21 square miles (26.44 km), of which 10.16 square miles (26.31 km) is land and 0.05 square miles (0.13 km) is water.
As of the census of 2010, there were 19,123 people, 6,644 households, and 4,938 families residing in the city. The population density was 1,889.6 inhabitants per square mile (729.6/km). There were 7,300 housing units at an average density of 721.3 per square mile (278.5/km). The racial makeup of the city was 89.7% White, 3.0% African American, 0.5% Native American, 1.9% Asian, 1.8% from other races, and 3.0% from two or more races. Hispanic or Latino of any race were 6.2% of the population.
There were 6,644 households of which 49.7% had children under the age of 18 living with them, 58.9% were married couples living together, 10.3% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 25.7% were non-families. 20.1% of all households were made up of individuals and 5% had someone living alone who was 65 years of age or older. The average household size was 2.85 and the average family size was 3.31.
The median age in the city was 30 years. 33.2% of residents were under the age of 18; 6.6% were between the ages of 18 and 24; 37.7% were from 25 to 44; 17.1% were from 45 to 64; and 5.3% were 65 years of age or older. The gender makeup of the city was 49.9% male and 50.1% female.
As of the census of 2000, there were 9,396 people, 3,307 households, and 2,460 families residing in the city. The population density was 1,898.5 people per square mile (732.9/km²). There were 3,533 housing units at an average density of 713.8 per square mile (275.6/km²). The racial makeup of the city was 94.13% White, 1.21% African American, 0.49% Native American, 1.05% Asian, 0.01% Pacific Islander, 1.26% from other races, and 1.85% from two or more races. Hispanic or Latino of any race were 2.99% of the population. 26.8% were of German, 18.2% American, 11.5% Irish and 5.6% English ancestry according to Census 2000.
There were 3,307 households out of which 47.8% had children under the age of 18 living with them, 58.5% were married couples living together, 11.1% had a female householder with no husband present, and 25.6% were non-families. 19.5% of all households were made up of individuals and 5.6% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.23.
In the city, the population was spread out with 33.1% under the age of 18, 8.4% from 18 to 24, 38.4% from 25 to 44, 13.7% from 45 to 64, and 6.4% who were 65 years of age or older. The median age was 29 years. For every 100 females, there were 96.9 males. For every 100 females age 18 and over, there were 93.7 males.
As of 2000 the median income for a household in the city was $50,807, and the median income for a family was $54,554. Males had a median income of $37,438 versus $27,553 for females. The per capita income for the city was $20,434. About 5.3% of families and 6.0% of the population were below the poverty line, including 6.1% of those under age 18 and 9.2% of those age 65 or over.