| Business | Phone |
| Charles Mix Cnty Courts Clerk 400 Main St, Lake Andes 57356 | (605) 487-7511 |
| Charles Mix County Extension 400 Main St, Lake Andes 57356 | (605) 487-7667 |
| Charles Mix County Nurse 400 Main St, Lake Andes 57356 | (605) 487-7094 |
| Charles Mix County Register 400 Main St, Lake Andes 57356 | (605) 487-7141 |
| Charles Mix County Veterans 400 Main St, Lake Andes 57356 | (605) 487-7691 |
| Charles Mix Extension Office 400 Main St, Lake Andes 57356 | (605) 487-7666 |
| Charles Mix Highway Engineer Main St, Lake Andes 57356 | (605) 487-7161 |
| Geographical Information Systs 400 E Main St, Lake Andes 57356 | (605) 487-6184 |