What about this one in eastern White Pine County, NV? DRA shows nearly 70% white, so it's not because of a reservation...
Seems to be great basin national park. Probably Federal goverment employss and tourism workers making it blue.
In the middle of Seattle in a sea of Biden +70 precincts there's this relatively conservative precint that's only Biden +23. It seems like all the county buildings are located here including an adult detention facility which I suspect is the cause of the area's conservatism.