Day County's estimated 2026 population is 5,521 with a growth rate of 0.67% in the past year according to the most recent United States census data. Day County is the 32nd largest county in South Dakota. The 2010 population was 5,710 and has seen a growth of -3.31% since that time.
Data after 2023 is projected based on recent change
Overall: 44.8 years
Female: 43.8 years
Male: 45.5 years
There are 4,220 adults, (1,449 of whom are seniors) in Day County.
Female: 2,722 (50.1%)
Male: 2,715 (49.9%)
The racial composition of Day County includes 84.09% White, 9.82% Native American, and smaller percentages for other race, Asian, Black or African American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 4,572 | 84.09% |
| Native American | 534 | 9.82% |
| Two or more races | 316 | 5.81% |
| Other race | 9 | 0.17% |
| Asian | 4 | 0.07% |
| Black or African American | 2 | 0.04% |
Day County's average per capita income is $46,046. Household income levels show a median of $66,033. The poverty rate stands at 14.82%.
Name | Median | Mean |
|---|---|---|
| Married Families | $99,211 | - |
| Families | $90,625 | $105,334 |
| Households | $66,033 | $91,552 |
| Non Families | $40,449 | $67,348 |
Average Income
Median Household Income
Poverty Rate