Dear Marlene Magiera,
Thank you for posting your question to History Hub!
Census records are part of Record Group 29, Records of the Bureau of the Census (https://www.archives.gov/findingaid/stat/discovery/29 ).
A great place for you to start your research would be here: https://www.archives.gov/research/genealogy/census/online-resources . Unfortunately, most of the 1890 Census was destroyed by a fire and subsequent water damage in 1921. However, later years can be found online and accessed through the link above.
Another source that you should explore is Record Group 75, Records of the Bureau of Indian Affairs ( https://www.archives.gov/research/native-americans/bia-guide ).
Here are some helpful links specifically about Native Americans and the Census:
We hope this information is helpful. Best of luck with your research!