| Business | Phone |
| Us Lake Information Po Box 289, Fort Thompson 57339 | (605) 245-2281 |
| Us Law & Order Branch Main St, Fort Thompson 57339 | (605) 245-2351 |
| Us Social Svc Dept Red Horse Rd, Fort Thompson 57339 | (605) 245-2356 |
| Us Chamberlain Administration Fort Thompson 57339 | (605) 245-2256 |