Pennington County's estimated 2026 population is 117,272 with a growth rate of 0.41% 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 15.82% since that time.
Data after 2023 is projected based on recent change
Overall: 40.1 years
Female: 41.1 years
Male: 39.2 years
There are 88,537 adults, (22,870 of whom are seniors) in Pennington County.
Female: 55,604 (49%)
Male: 57,908 (51%)
The racial composition of Pennington County includes 79% White, 6.77% Native American, and smaller percentages for other race, Asian, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 89,672 | 79% |
| Two or more races | 11,871 | 10.46% |
| Native American | 7,690 | 6.77% |
| Other race | 1,578 | 1.39% |
| Asian | 1,401 | 1.23% |
| Black or African American | 1,280 | 1.13% |
| Native Hawaiian or Pacific Islander | 20 | 0.02% |
Pennington County's average per capita income is $47,874. Household income levels show a median of $74,517. The poverty rate stands at 11.16%.
Name | Median | Mean |
|---|---|---|
| Married Families | $104,416 | $137,676 |
| Families | $92,479 | $123,622 |
| Households | $74,517 | $99,289 |
| Non Families | $45,577 | $59,084 |
Average Income
Median Household Income
Poverty Rate