Two ghost towns are close to each other and easy to get to. A modern car could get to one without scraping the oil pan. One still has a few residents. Not mentioned on either list above.
The other group of towns are harder to get to. I haven't been to all of them yet. Only one is listed above. It's fairly easy to get to, the others aren't.
When you come to a fork in the road, take the single track instead.