Per 2017 Chapman University survey, about 16% of Americans believe in reality of Bigfoot creature (see link below).
Number appears high given that nobody in my family, coworkers, college friends, neighbors, backpacking friends, etc. believe in such.
I was in such camp until I had my sighting.
Also surprising is that BF belief ranks way below belief that Atlantis existed (a claim with no physical evidence based on ancient stories).
Not surprising that belief in aliens visiting earth is above BF belief, given that the US Air Force investigated UFOs for years (1947-1969) and took it seriously.
https://blogs.chapman.edu/wilkinson/2017/10/11/paranormal-america-2017/
I don't know how accurate or statistically significant is this survey. Thus, I am not sure if it truly represents American beliefs.