Quite well! Most ghost-types are actually urban in nature; that is, they thrive in cities more than secluded places out in the country. This is because they often cohabit with humans for any of a number of reasons, including they derive entertainment from us, we nourish them (some feed off of fear, that is … or our waste products), or they quite literally come from us (either as our literal spirits, the remnants of our emotions, or animated objects from our daily lives).
In short, the more humans there are and the older a city may be, the more likely it’s inhabited by certain ghost-type pokémon. Remote areas, of course, aren’t necessarily devoid of ghost-types; they’re simply host to different species.
The Pokédex According to Bill 