Pennington County's estimated 2025 population is 119,097 with a growth rate of 1.36% in the past year according to the most recent United States census data. Pennington County is the 2nd largest county in South Dakota. The 2010 population was 101,253 and has seen a growth of 17.62% since that time.
Data after 2023 is projected based on recent change
The racial composition of Pennington County includes 80.33% White, 7.05% Native American, and smaller percentages for Black or African American, other race, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Native American
Black or African American
Other race
Asian
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 90,040 | 80.33% |
| Two or more races | 10,129 | 9.04% |
| Native American | 7,905 | 7.05% |
| Black or African American | 1,463 | 1.31% |
| Other race | 1,288 | 1.15% |
| Asian | 1,231 | 1.1% |
| Native Hawaiian or Pacific Islander | 25 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Pennington County's average per capita income is $44,318. Household income levels show a median of $70,768. The poverty rate stands at 12.04%.
Name | Median | Mean |
|---|---|---|
| Married Families | $101,586 | $131,104 |
| Families | $90,248 | $118,504 |
| Households | $70,768 | $95,438 |
| Non Families | $41,119 | $58,887 |
Average Income
Median Household Income
Poverty Rate