Founded in 1873, Hyde County is one of 66 counties in the state of South Dakota. Historically, Hyde County was formed from Buffalo County. The city of Highmore is the county seat. With FIPS code of 69, Hyde County has a population of 1,236 and area of 861 square miles (2,230 km2).
List of all cities in Hyde County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Highmore, SD | 57345 | 605 |
| Holabird, SD | 57540 | 605 |
| Howell, SD | 57345 | 605 |
| Stephan, SD | 57346 | 605 |
| Tennis, SD | 57345 | 605 |