Why are Exurbs so Republican ?

[I spent the winter writing songs about getting better]

Outside of some that has a large non-white population (usually a case of that town developing before the suburbs did and getting swallowed up by sprawl) and that have notable colleges and serve as a college town of sorts as well (like Denton, TX), there's basically zero demographic reason for them to vote D. They're predominantly white, usually not that college educated since they attract a lot of commuters to more blue collar jobs and the local jobs also tend to be less college education-based and don't have a cosmopolitan sort of aesthetic that liberals find appealing. Also they're very car-based and terrible places if you want to be car free or at least minimize their use, which is rare for non-liberals.