| Business | Phone |
| Armory Grade School 405 Ingalls Ave Sw, De Smet 57231 | (605) 854-3963 |
| De Smet High School 405 3rd St Sw, De Smet 57231 | (605) 854-3674 |
| De Smet School Superintendent 405 3rd St, De Smet 57231 | (605) 854-3070 |
| Schools-City 111 Prairie Ave Nw, De Smet 57231 | (605) 854-3055 |