Founded in 1862, Deuel County is one of 66 counties in the state of South Dakota. Historically, Deuel County was formed from Brookings County. The city of Clear Lake is the county seat. With FIPS code of 39, Deuel County has a population of 4,272 and area of 624 square miles (1,616 km2).
List of all cities in Deuel County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Altamont, SD | 57226 | 605 |
| Astoria, SD | 57213 | 605 |
| Bemis, SD | 57238 | 605 |
| Brandt, SD | 57218 | 605 |
| Clear Lake, SD | 57226 | 605 |
| Gary, SD | 57237 | 605 |
| Goodwin, SD | 57238 | 605 |
| Johnsonville, SD | 57268 | 605 |
| Toronto, SD | 57268 | 605 |
| Tunnerville, SD | 57226 | 605 |