AEdit
Absentee-Shawnee Tribe of Indians of Oklahoma
Agua Caliente Band of Cahuilla Indians of the Agua Caliente Indian Reservation, California
Ak-Chin Indian Community (previously listed as Ak Chin Indian Community of the Maricopa (Ak Chin) Indian Reservation, Arizona)
Alabama-Coushatta Tribe of Texas (previously listed as Alabama-Coushatta Tribes of Texas)
Alabama-Quassarte Tribal Town, Oklahoma
Alturas Indian Rancheria, California
Apache Tribe of Oklahoma
Arapaho Tribe of the Wind River Reservation, Wyoming
Aroostook Band of Micmac, Maine (previously listed as Aroostook Band of Micmac Indians)
Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation, Montana
Augustine Band of Cahuilla Indians, California (previously listed as Augustine Band of Cahuilla Mission Indians of the Augustine Reservation) - reportedly the smallest federally recognized tribe, with six members.