From a total population of 22,580, Yankton County has a median age of 40.9. The average age of males, in Yankton County, is 39.8 while the average age of females is 42.5. When you compare this to median age of South Dakota, Yankton County is 4.1 years older.
The median income of individuals, in Yankton County, is $26,831 while the average household income is $50,044. When comparing the median income of people living in Yankton County to the rest of South Dakota, the average income in Yankton County is $520 more.