Founded in 1873, Buffalo County is one of 66 counties in the state of South Dakota. Historically, Buffalo County was formed from unorganized territory. The city of Gann Valley is the county seat. With FIPS code of 17, Buffalo County has a population of 1,923 and area of 471 square miles (1,220 km2).
List of all cities in Buffalo County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Bailey, SD | 57341 | 605 |
| Crow Creek, SD | 57339 | 605 |
| Fort Thompson, SD | 57339 | 605 |
| Gann Valley, SD | 57341 | 605 |