Dear Ms. Plummer,
Thank you for posting your request on History Hub!
Since the Tunica-Biloxi Tribe of Louisiana did not receive Federal acknowledgement as an Indian Tribe until 1981, they were not separately censused. We suggest that you contact the tribal government to inquire about any internal records of population.
We searched the National Archives Catalog and located 21 Population Schedules in the Records of the Bureau of the Census (Record Group 29) that would include individuals from the Tunica-Biloxi locale. Sometimes, Native Americans were noted with an “I”, “In”, or “American Indian” within the census. Some of the schedules have been digitized in part or whole (for 1940 only). For access to the non-digitized schedules, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
For information about the U.S. Census, see the Census Bureau technical documentation and questionnaires.
You may wish to search Ancestry.com for the U.S. Census. There may be a fee for using Ancestry. Instead, some of the images from Ancestry are available for free on Family Search or at your local library. Many library systems subscribe to these sites, making them free for their patrons.
We hope this is helpful. Best of luck with your family research!
[Some information provided by Cody White, Subject Matter Expert]