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, Native Hawaiian or Pacific Islander and multiracial populations.
White
Native American
Two or more races
Other race
Asian
Black or African American
Native Hawaiian or Pacific Islander
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% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
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