Pennington County's estimated 2026 population is 116,269 with a growth rate of 0.12% 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 14.83% 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 (80.33%)
Two or more races (9.04%)
Native American (7.05%)
Black or African American (1.31%)
Other race (1.15%)
Asian (1.1%)
Native Hawaiian or Pacific Islander (0.02%)
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