Clay Center is a city located in Clay County Kansas. It is also the county seat of Clay County. With a 2020 population of 3,967, it is the 72nd largest city in Kansas and the 5438th largest city in the United States . Clay Center is currently declining at a rate of -0.20% annually and its population has decreased by -8.47% since the most recent census, which recorded a population of 4,334 in 2010. Clay Center reached it's highest population of 4,963 in 1970. Spanning over 3 miles, Clay Center has a population density of 1,247 people per square mile.
The average household income in Clay Center is $53,953 with a poverty rate of 7.74%. The median rental costs in recent years comes to $597 per month, and the median house value is $86,100. The median age in Clay Center is 44.9 years, 38 years for males, and 53 years for females.