Clay Center is a city in and the county seat of Clay County, Kansas, United States. As of the 2010 census, the city population was 4,334.
Clay Center was first settled in 1862. It was named from its position near the geographical center of Clay County.
The first post office was established in Clay Center on July 3, 1862.
As of the census of 2010, there were 4,334 people, 1,920 households, and 1,172 families residing in the city. The population density was 1,407.1 inhabitants per square mile (543.3/km²). There were 2,158 housing units at an average density of 700.6 per square mile (270.5/km²). The racial makeup of the city was 96.9% White, 0.5% African American, 0.6% Native American, 0.3% Asian, 0.4% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.8% of the population.
There were 1,920 households of which 27.0% had children under the age of 18 living with them, 48.8% were married couples living together, 8.2% had a female householder with no husband present, 4.0% had a male householder with no wife present, and 39.0% were non-families. 35.0% of all households were made up of individuals and 20.1% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.82.
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