Mellette County's 2026 population is estimated at 1,816, reflecting a -0.49% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Mellette County is the 58th largest county in South Dakota. The 2010 population was 2,026 and has grown -10.37% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.5 years
Female: 38 years
Male: 36.4 years
There are 1,386 adults, (319 of whom are seniors) in Mellette County.
Female: 989 (50.9%)
Male: 954 (49.1%)
The racial composition of Mellette County includes 56.41% Native American, 34.69% White, and smaller percentages for other race, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Native American | 1,096 | 56.41% |
| White | 674 | 34.69% |
| Two or more races | 156 | 8.03% |
| Other race | 10 | 0.51% |
| Native Hawaiian or Pacific Islander | 7 | 0.36% |
Mellette County 's average per capita income is $32,981. Household income levels show a median of $54,076. The poverty rate stands at 41.74%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $70,625 | - |
| Families | $56,081 | $83,180 |
| Households | $54,076 | $74,230 |
| Non Families | $32,279 | $52,578 |
Average Income
Median Household Income
Poverty Rate