| Business | Phone |
| Water Plant 199 N Kansas St, Clark 57225 | (605) 532-5411 |
| City Financial Office 120 N Commercial St, Clark 57225 | (605) 532-3512 |
| Disposal Plant 1/2 Mile Out Of Town, Clark 57225 | (605) 532-3321 |
| Machine Shop 111 1st Ave W, Clark 57225 | (605) 532-3645 |