Sully County's estimated 2026 population is 1,434 with a growth rate of -1.17% in the past year according to the most recent United States census data. Sully County is the 62nd largest county in South Dakota. The 2010 population was 1,377 and has seen a growth of 4.14% since that time.
Data after 2023 is projected based on recent change
The racial composition of Sully County includes 92.51% White, 5% Black or African American, and smaller percentages for Two or more races, other race and multiracial populations.
White (92.51%)
Black or African American (5%)
Two or more races (1.96%)
Other race (0.54%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 1,370 | 92.51% |
| Black or African American | 74 | 5% |
| Two or more races | 29 | 1.96% |
| Other race | 8 | 0.54% |
Married
Widowed
Divorced
Separated
Never Married
Sully County's average per capita income is $46,304. Household income levels show a median of $70,250. The poverty rate stands at 7.94%.
Name | Median | Mean |
|---|---|---|
| Married Families | $103,438 | - |
| Families | $95,673 | $122,258 |
| Households | $70,250 | $106,129 |
| Non Families | $53,160 | $80,024 |
Average Income
Median Household Income
Poverty Rate