Day County's estimated 2025 population is 5,403 with a growth rate of -0.44% 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 -5.38% since that time.
Data after 2023 is projected based on recent change
The racial composition of Day County includes 85.37% White, 9.52% Native American, and smaller percentages for other race, Asian, Black or African American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 4,661 | 85.37% |
| Native American | 520 | 9.52% |
| Two or more races | 242 | 4.43% |
| Other race | 25 | 0.46% |
| Asian | 9 | 0.16% |
| Black or African American | 3 | 0.05% |
Married
Widowed
Divorced
Separated
Never Married
Day County's average per capita income is $41,890. Household income levels show a median of $62,270. The poverty rate stands at 13.99%.
Name | Median | Mean |
|---|---|---|
| Married Families | $93,616 | - |
| Families | $81,726 | $97,153 |
| Households | $62,270 | $86,182 |
| Non Families | $39,360 | $66,642 |
Average Income
Median Household Income
Poverty Rate