Founded in 1873, Grant County is one of 66 counties in the state of South Dakota. Historically, Grant County was formed from Codington and Deuel Counties. The city of Milbank is the county seat. With FIPS code of 51, Grant County has a population of 7,519 and area of 682 square miles (1,766 km2).
List of all cities in Grant County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Albee, SD | 57259 | 605 |
| Big Stone City, SD | 57216 | 605 |
| Labolt, SD | 57246 | 605 |
| Marvin, SD | 57251 | 605 |
| Milbank, SD | 57252 | 605 |
| 57253 | 605 | |
| Revillo, SD | 57259 | 605 |
| State Auto Insurance, SD | 57253 | 605 |
| Stockholm, SD | 57264 | 605 |
| Strandburg, SD | 57265 | 605 |
| Troy, SD | 57265 | 605 |
| Twin Brooks, SD | 57269 | 605 |