Founded in 1873, Walworth County is one of 66 counties in the state of South Dakota. Historically, Walworth County was formed from Buffalo County. The city of Selby is the county seat. With FIPS code of 129, Walworth County has a population of 5,248 and area of 708 square miles (1,834 km2).
List of all cities in Walworth County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Akaska, SD | 57420 | 605 |
| Foster, SD | 57601 | 605 |
| Glenham, SD | 57631 | 605 |
| Gopher, SD | 57601 | 605 |
| Java, SD | 57452 | 605 |
| Lowry, SD | 57472 | 605 |
| Mobridge, SD | 57601 | 605 |
| Promise, SD | 57601 | 605 |
| Selby, SD | 57472 | 605 |
| Sitka, SD | 57472 | 605 |