From a total population of 13,968, Clay County has a median age of 25.2. The average age of males, in Clay County, is 25.5 while the average age of females is 25. When you compare this to median age of South Dakota, Clay County is 11.6 years younger.
The median income of individuals, in Clay County, is $21,044 while the average household income is $36,627. When comparing the median income of people living in Clay County to the rest of South Dakota, the average income in Clay County is $5,267 less.