Standing Rock Agency: formerly known and established in 1868 as Grand River Agency on the banks of the Grand River (South Dakota) and relocated upstream in 1874 and renamed Standing Rock Agency (Ft. Yates, North Dakota), is the Field Office for the Bureau of Indian Affairs providing Trust Services and Indian Services to the Standing Rock Sioux Tribe. Services include real estate, probate and estate, wildland fire management, administrative, facilities management, and law enforcement services.

The Lower Brule Agency is located at Lower Brule, South Dakota, and services the Lower Brule Sioux Tribe and Tribal Lands in Lyman and Stanley counties in central South Dakota. Lower Brule Law Enforcement Office covers the Lower Brule Sioux Tribal Lands. The Bureau of Indian Affairs - Office of Law Enforcement has overall responsibility of enforcement of Federal and Tribal Laws within the Lower Brule Sioux Tribal Lands.

The Sisseton Agency provides the following services on the Lake Travers Reservation: realty services, probate, social services, and road maintenance.

Website has a list of FAQ's such as "Where do I check to see if I am eligible for enrollment?, Where do I search for someone on one of the reservations?, Where can I find information about travel through the reservations?" https://sdtribalrelations.sd.gov/frequent-questions.aspx For links to cultural events, visit: https://sdtribalrelations.sd.gov/events/cultural-events.aspx

The Yankton Sioux Tribe is located in the lower eastern part of Charles Mix County. The Tribe has approximately 11,594 members and approximately 4,600 member reside within the boundaries. Law enforcement covering Yankton Sioux Tribe.

The Great Plains Regional office is responsible for the direction and oversight of Bureau responsibilities and activities in South Dakota, North Dakota, and Nebraska. The Office of the Regional Director provides program direction and supervision to 12 Agencies encompassing 16 federally recognized Tribes. Programs includes: tribal government, enrollment, claims, self-determination, housing improvement program, loan guaranty and interest subsidy program, land titles and records office, probate and estate services, real estate services, Indian land consolidation program, Division of Natural Resources, Human services (which includes general assistance, burial assistance, disaster assistance, emergency assistance, adult care assistance, and child assistance), Tribal transportation program, road maintenance, and Division of Environment, Safety, and Cultural Resources Managements.

Services provided to the Tribe are probate and estate, real estate, natural resources, fire management, tribal operations, self-determination, facilities management, and social services.

The Bureau of Indian Affairs Pine Ridge Agency is located in Pine Ridge, South Dakota and provides services to the Oglala Sioux Tribe. Services include Real Estate Services (Leasing, Rights-of-Ways, and Acquisition & Disposition), fire management, social services, land operations, probate & estate services, facilities management, executive direction and administrative services.

Major programs operated by the agency include: executive direction and administration, Real Property Management (Realty and Natural Resources), road maintenance, wildland fire, Human Services, probate, and transportation.