The urban-rural divide isn't too shocking; what's curious to me is the incredible consistency of the suburbs (at ~20%), and also the overall preference for small towns.
The terms "city" and "rural area" are pretty well-understood, but "suburb" and "small town" likely mean different things to different people. These responses are to an abstract "if you could live anywhere..." question. I wonder how each density type fits with the actual home addresses of responders; i.e. which density type has the highest proportion of residents who would prefer to stick around in an ideal world?