Seward County (standard abbreviation: SW) is a county of the U.S. state of Kansas. As of the 2010 census, the county population was 22,952. The largest city and county seat is Liberal. The county was formed on March 20, 1873 and named after William Henry Seward, an American politician and Secretary of State under Abraham Lincoln and Andrew Johnson.
According to the U.S. Census Bureau, the county has a total area of 640 square miles (1,700 km), of which 639 square miles (1,660 km) is land and 1.0 square mile (2.6 km) (0.2%) is water. It borders Oklahoma to the south.
The Liberal, KS Micropolitan Statistical Area includes all of Seward County.
As of the census of 2000, there were 22,510 people, 7,419 households, and 5,504 families residing in the county. The population density was 35 people per square mile (14/km²). There were 8,027 housing units at an average density of 13 per square mile (5/km²). The racial makeup of the county was 65.44% White, 3.78% Black or African American, 0.77% Native American, 2.86% Asian, 0.06% Pacific Islander, 23.81% from other races, and 3.27% from two or more races. 42.14% of the population were Hispanic or Latino of any race.
There were 7,419 households out of which 43.50% had children under the age of 18 living with them, 59.60% were married couples living together, 10.00% had a female householder with no husband present, and 25.80% were non-families. 20.60% of all households were made up of individuals and 7.80% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.46.
In the county, the population was spread out with 32.00% under the age of 18, 11.70% from 18 to 24, 30.50% from 25 to 44, 16.90% from 45 to 64, and 8.90% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 105.30 males. For every 100 females age 18 and over, there were 103.70 males.
The median income for a household in the county was $36,752, and the median income for a family was $41,134. Males had a median income of $29,765 versus $21,889 for females. The per capita income for the county was $15,059. About 13.90% of families and 16.90% of the population were below the poverty line, including 21.00% of those under age 18 and 7.30% of those age 65 or over.