| Business | Phone |
| Kingsbury 4-H Ctr 107 Lyle Ave Ne, De Smet 57231 | (605) 854-9902 |
| Kingsbury Cnty Register-Deeds 202 2nd St Sw, De Smet 57231 | (605) 854-3591 |
| Kingsbury County Commissioners 101 2nd Se, De Smet 57231 | (605) 854-3833 |
| Kingsbury County Commissioners 202 2nd St Se, De Smet 57231 | (605) 854-3833 |
| Kingsbury County Equalization 202 2nd St Se, De Smet 57231 | (605) 854-3593 |
| Kingsbury County Extension 101 Lyle Ave Ne, De Smet 57231 | (605) 854-3851 |
| Kingsbury County Highway Supt 43189 Us Highway 14, De Smet 57231 | (605) 854-3491 |