The De Smet, South Dakota example is a good one. For a more northerly North American example, High Level Alberta, Canada has a population of 3100 and a service

The De Smet, South Dakota example is a good one. For a more northerly North American example, High Level Alberta, Canada has a population of 3100 and a service population of 20k. First settlers in 1947, it was incorporated in 1965. There is a paved airstrip long enough for a 747, and a hospital. It would be the sleepiest of little villages in southern Europe and/or the USA, and would have a service area not much bigger than its population. The further north you go, the more towns have and require outsized services.