From a total population of 1,461, Sully County has a median age of 45.9. The average age of males, in Sully County, is 44.8 while the average age of females is 46.4. When you compare this to median age of South Dakota, Sully County is 9.1 years older.
The median income of individuals, in Sully County, is $36,707 while the average household income is $61,806. When comparing the median income of people living in Sully County to the rest of South Dakota, the average income in Sully County is $10,396 more.