Gregory County's 2026 population is estimated at 4,003, reflecting a -0.84% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Gregory County is the 41st largest county in South Dakota. The 2010 population was 4,270 and has grown -6.25% since 2010.
Overall: 44.7 years
Female: 47.2 years
Male: 42.9 years
There are 3,037 adults, (1,068 of whom are seniors) in Gregory County.
Female: 1,963 (48.9%)
Male: 2,053 (51.1%)
The racial composition of Gregory County includes 86.53% White, 4.03% Native American, and smaller percentages for Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 3,475 | 86.53% |
| Two or more races | 291 | 7.25% |
| Native American | 162 | 4.03% |
| Asian | 43 | 1.07% |
| Black or African American | 35 | 0.87% |
| Native Hawaiian or Pacific Islander | 10 | 0.25% |
Gregory County 's average per capita income is $42,562. Household income levels show a median of $62,917. The poverty rate stands at 9.53%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,798 | - |
| Families | $88,851 | $102,220 |
| Households | $62,917 | $81,084 |
| Non Families | $35,164 | $47,793 |
Average Income
Median Household Income
Poverty Rate