I'm in a town in a ~2,000 square mile county, where the county population is less than 40,000 and the town is a bit more than 10,000. There is a county transit authority (which is subsidized) that runs a couple of buses and a few taxis (I don't think they are subsidized, but labor here is cheap and it isn't a hard place to find your way around).
There's lots of places with lower population density than that, but the viability of something that costs 60 or 70 percent of what a taxi costs kicks in at some pretty low point.
There's lots of places with lower population density than that, but the viability of something that costs 60 or 70 percent of what a taxi costs kicks in at some pretty low point.