Burkina Faso :- Burkinabé.
Idaho :- Idahoan, Idahoer.
Utah :- Utahn, Utahan; Utatian.

Are there fixed ones for all the states?

Here's a list from Wikipedia, and another one from the State History Guide website.

Saskatchewan :- Saskatchewanian, Fransaskois.




Ceci n'est pas un seing.