Clay County's estimated 2025 population is 15,691 with a growth rate of 0.84% in the past year according to the most recent United States census data. Clay County is the 14th largest county in South Dakota. The 2010 population was 13,830 and has seen a growth of 13.46% since that time.
Data after 2023 is projected based on recent change
The racial composition of Clay County includes 86.74% White, 4% Native American, 3.02% Asian, and smaller percentages for Black or African American, other race, Native Hawaiian or Pacific Islander and multiracial populations.
White (86.7%)
Native American (4.0%)
Two or more races (4.0%)
Asian (3.0%)
Black or African American (2.0%)
Other race (0.2%)
Native Hawaiian or Pacific Islander (0.1%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 13,127 | 86.74% |
| Native American | 605 | 4% |
| Two or more races | 597 | 3.95% |
| Asian | 457 | 3.02% |
| Black or African American | 304 | 2.01% |
| Other race | 30 | 0.2% |
| Native Hawaiian or Pacific Islander | 13 | 0.09% |
Married
Widowed
Divorced
Separated
Never Married
Clay County's average per capita income is $46,501. Household income levels show a median of $58,794. The poverty rate stands at 19.83%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,756 | - |
| Families | $96,029 | $109,742 |
| Households | $58,794 | $76,464 |
| Non Families | $34,722 | $43,445 |
Average Income
Median Household Income
Poverty Rate