Brown County's 2026 population is estimated at 37,185, reflecting a -0.42% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Brown County is the 5th largest county in South Dakota. The 2010 population was 36,655 and has grown 1.45% since 2010.
Data after 2023 is projected based on recent change
Overall: 37.8 years
Female: 38.7 years
Male: 36.8 years
There are 28,929 adults, (6,731 of whom are seniors) in Brown County.
Female: 19,092 (50.4%)
Male: 18,785 (49.6%)
The racial composition of Brown County includes 85.39% White, 3.05% Native American, and smaller percentages for Asian, other race, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 32,343 | 85.39% |
| Two or more races | 2,050 | 5.41% |
| Native American | 1,154 | 3.05% |
| Asian | 1,121 | 2.96% |
| Other race | 620 | 1.64% |
| Black or African American | 561 | 1.48% |
| Native Hawaiian or Pacific Islander | 28 | 0.07% |
Brown County 's average per capita income is $48,654. Household income levels show a median of $70,898. The poverty rate stands at 11.72%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $115,402 | - |
| Families | $100,857 | $123,174 |
| Households | $70,898 | $92,772 |
| Non Families | $40,480 | $53,294 |
Average Income
Median Household Income
Poverty Rate