> It's possible that there are walkable communities outside of NY and SF. I don't know if anyone has ever thought to check, though.
Check out https://www.walkscore.com/cities-and-neighborhoods/
Keep in mind that even cities that have lower scores overall often have some very walkable neighborhoods. For example, Los Angeles has an overall walk score of 68, but has several neighborhoods that score 90 and above.
It might even be that if a bunch of people who value things like walkable communities move to a place and get involved, they could even make one. It's just crazy enough to work.