25 CFR § 83.20
How does an entity request Federal acknowledgment?
February 24, 2021
Any entity that believes it can satisfy the criteria in this part may submit a documented petition under this part to: Department of the Interior, Office of the Assistant Secretary—Indian Affairs, Attention: Office of Federal Acknowledgment, Mail Stop 4071 MIB, 1849 C Street NW, Washington, DC 20240.
[83 FR 33826, July 18, 2018]