From a total population of 104,574, Pennington County has a median age of 37. The average age of males, in Pennington County, is 35.7 while the average age of females is 38.5. When you compare this to median age of South Dakota, Pennington County is 0.2 years older.
The median income of individuals, in Pennington County, is $26,906 while the average household income is $50,564. When comparing the median income of people living in Pennington County to the rest of South Dakota, the average income in Pennington County is $595 more.