| Business | Phone |
| Us Indian Affairs Bureau 1000 N Crescent St, Flandreau 57028 | (605) 997-2949 |
| Commodity Warehouse 601 W Broad Ave, Flandreau 57028 | (605) 997-2402 |
| Community Health Represent 607 W Broad Ave, Flandreau 57028 | (605) 997-2302 |
| Community Health Represent 701 W Broad Ave, Flandreau 57028 | (605) 997-2302 |
| Flandreau Community Health Pln 104 W Ross Ave, Flandreau 57028 | (605) 997-3922 |
| Flandreau Community Health Pln 208 W Ross Ave, Flandreau 57028 | (605) 997-3922 |
| Flandreau Community Health Pln 701 W Broad Ave, Flandreau 57028 | (605) 997-3922 |
| Flandreau Counseling Ctr 1109 S Veterans St, Flandreau 57028 | (605) 997-3844 |
| Flandreau Housing Authority 100 Allen Ave, Flandreau 57028 | (605) 997-2194 |
| Flandreau Santee Sioux Tribe 403 W Broad Ave, Flandreau 57028 | (605) 997-5123 |
| Flandreau Tribal Advocate 104 W Ross Ave, Flandreau 57028 | (605) 997-5044 |
| Flandreau Tribal Agriculture 214 E 2nd Ave, Flandreau 57028 | (605) 997-2336 |
| Flandreau Tribal Clinic 607 W Broad Ave, Flandreau 57028 | (605) 997-2642 |
| Flandreau Tribal Court 208 W Ross Ave, Flandreau 57028 | (605) 997-3593 |
| Flandreau Tribal Office 601 W Broad Ave, Flandreau 57028 | (605) 997-3891 |