Buffalo County's estimated 2026 population is 1,707 with a growth rate of -3.34% in the past year according to the most recent United States census data. Buffalo County is the 61st largest county in South Dakota. The 2010 population was 1,934 and has seen a growth of -11.74% since that time.
Data after 2023 is projected based on recent change
The racial composition of Buffalo County includes 75.01% Native American, 21.68% White, and smaller percentages for Two or more races, other race and multiracial populations.
Native American (75.01%)
White (21.68%)
Two or more races (2.33%)
Other race (0.97%)
Race | Population | Percentage (of total) |
|---|---|---|
| Native American | 1,318 | 75.01% |
| White | 381 | 21.68% |
| Two or more races | 41 | 2.33% |
| Other race | 17 | 0.97% |
Married
Widowed
Divorced
Separated
Never Married
Buffalo County's average per capita income is $35,354. Household income levels show a median of $47,000. The poverty rate stands at 32.49%.
Name | Median | Mean |
|---|---|---|
| Married Families | $83,571 | - |
| Families | $53,681 | $62,863 |
| Households | $47,000 | $54,977 |
| Non Families | $14,926 | $36,808 |
Average Income
Median Household Income
Poverty Rate