| Population | 691 |
| Square Miles | 1,406.62 |
| Population Density | 0.49 |
| Median Age | 40 |
| Median Household Income | $25,268 |
| Per Capita Income | $13,585 |
| Median Rent | $254 |
| Percent Renters | 31% |
| Median Buffalo, SD 57720 For Sale Price: | $889,700 |
| 1 Bedroom For Sale Median Price: | $889,700 |
| 2 Bedroom For Sale Median Price: | $49,900 |