| Business | Phone |
| Utilities Commission 500 E Capitol Ave, Pierre 57501 | (605) 773-3201 |
| Telecommunications Div 910 E Sioux Ave, Pierre 57501 | (605) 773-7277 |
| State Radio Communications E Highway 34, Pierre 57501 | (605) 773-3536 |
| State Telecommunications 910 E Sioux Ave, Pierre 57501 | (605) 773-3416 |
| Energy Assistance 206 W Missouri Ave, Pierre 57501 | (605) 773-3668 |