But what is a realistic definition of "the area where they are?" From some old research of mine, which I may update, the home territory for black bears ranges from 1-15 square miles (females) to 8-60 square miles (males). For grizzlies, its 50-300 square miles (females) up to 1,500 square miles (males).* Where would Bigfoot, as a species, slot in to that? Also, what would the regional variations be? Certainly in the PNW, one should expect more compact and stable home ranges. In the northeast US, one of the most "crowded" sighting areas is the corridor around Whitehall, New York.** I don't believe that all of those Bigfoot encounters are the result of Bigfoots that have a home range there.
* No citations, I need to update this rudimentary effort.
** This is circa 2018 research.