Buffalo County's estimated 2026 population is 1,795 with a growth rate of -0.39% in the past year according to the most recent United States census data. Buffalo County is the 59th largest county in South Dakota. The 2010 population was 1,934 and has seen a growth of -7.19% since that time.
Data after 2023 is projected based on recent change
Overall: 22.8 years
Female: 25.9 years
Male: 21.4 years
There are 1,100 adults, (166 of whom are seniors) in Buffalo County.
Female: 798 (44.1%)
Male: 1,010 (55.9%)
The racial composition of Buffalo County includes 78.98% Native American, 17.48% White, and smaller percentages for Two or more races, other race and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| Native American | 1,428 | 78.98% |
| White | 316 | 17.48% |
| Two or more races | 47 | 2.6% |
| Other race | 17 | 0.94% |
Buffalo County's average per capita income is $39,412. Household income levels show a median of $47,045. The poverty rate stands at 33.91%.
Name | Median | Mean |
|---|---|---|
| Married Families | $90,833 | - |
| Families | $59,615 | $69,142 |
| Households | $47,045 | $57,605 |
| Non Families | $15,000 | $34,574 |
Average Income
Median Household Income
Poverty Rate