Mountaindale isn't really a place. At least, it's not anymore, and it hasn't been for a long time.
When I was a child, there was a little store with a gas pump at the intersection of a couple quiet country roads. For me, it was a sort of landmark; we turned at the store, went past the old, red, one-room schoolhouse, and then we were at Grandma's house. A few times my grandmother took me on a quick errand to get milk or butter at the Mountaindale General Store, although we usually went into the small nearby town of North Plains or further to Cornelius or Hillsboro for any more significant shopping. My memory of the Mountaindale General Store is not very clear, but in my imagination it was a creaky old wooden affair with a few creaky old locals hanging out inside.
Appropriately, during the store's waning years, it served as a shooting location for an episode of some forgotten TV show titled Nowhere Man. I never watched it, but the reviews on IMDb are quite positive. Mountaindale played the role of a Southern town with a population of 37. "Is this the whole town?" the protagonist asks after getting off the bus. The store was the last remnant of Mountaindale to close.