Clay county is located in southeast South Dakota. Clay county has 412.18 square miles of land area and 5.05 square miles of water area. As of 2010-2014, the total Clay county population is 13,968, which has grown 3.18% since 2000. The population growth rate is much lower than the state average rate of 10.58% and is much lower than the national average rate of 11.61%. Clay county median household income is $36,627 in 2010-2014 and has grown by 33.02% since 2000. The income growth rate is lower than the state average rate of 42.67% and is higher than the national average rate of 27.36%. Clay county median house value is $136,000 in 2010-2014 and has grown by 71.07% since 2000. The house value growth rate is about the same as the state average rate of 70.48% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Clay county is much better than the state average in quality. The Clay county area code is 605.
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