Grant County's 2026 population is estimated at 7,712, reflecting a 0.61% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Grant County is the 23rd largest county in South Dakota. The 2010 population was 7,351 and has grown 4.91% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.5 years
Female: 45.7 years
Male: 41.2 years
There are 5,886 adults, (1,767 of whom are seniors) in Grant County.
Female: 3,630 (48%)
Male: 3,933 (52%)
The racial composition of Grant County includes 90.73% White, and smaller percentages for Two or more races, Native American, other race, Asian, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 6,862 | 90.73% |
| Two or more races | 221 | 2.92% |
| Native American | 203 | 2.68% |
| Other race | 189 | 2.5% |
| Asian | 60 | 0.79% |
| Black or African American | 28 | 0.37% |
Grant County 's average per capita income is $45,772. Household income levels show a median of $75,028. The poverty rate stands at 11.58%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $100,579 | - |
| Families | $94,931 | $111,447 |
| Households | $75,028 | $88,634 |
| Non Families | $36,250 | $45,353 |
Average Income
Median Household Income
Poverty Rate