Clark County's 2026 population is estimated at 4,032, reflecting a 0.72% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Clark County is the 40th largest county in South Dakota. The 2010 population was 3,698 and has grown 9.03% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.3 years
Female: 38.4 years
Male: 41.9 years
There are 2,766 adults, (921 of whom are seniors) in Clark County.
Female: 1,952 (49.8%)
Male: 1,965 (50.2%)
The racial composition of Clark County includes 90.83% White, and smaller percentages for Native American, Asian, Black or African American, other race and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 3,558 | 90.83% |
| Two or more races | 274 | 7% |
| Native American | 29 | 0.74% |
| Asian | 27 | 0.69% |
| Black or African American | 21 | 0.54% |
| Other race | 8 | 0.2% |
Clark County 's average per capita income is $42,933. Household income levels show a median of $70,726. The poverty rate stands at 10.85%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $92,895 | - |
| Families | $83,024 | $103,872 |
| Households | $70,726 | $90,733 |
| Non Families | $43,688 | $66,254 |
Average Income
Median Household Income
Poverty Rate