I'm an independent contractor, I work from home (often times with companies outside of my home city) and I doubt (from experience) you're are going to find many startup opportunities that cultivate remote working; I envision the startup experience as being something akin to a team based sport. You need to be together to roll with the punches, so to speak; there's an immediacy of communication and deliverance of intent that happens when you are physically proximate to each other.

Established organizations have processes and they are established, nothing changes too quickly, therefore making it more feasible to leverage remote workers.