I lived in Iowa City from 1986 to 1988, and Conesville, which is nearby, remains quite vivid in my mind.
In the very heart of the town was an enormous grain silo, surrounded by mud, grass, and junk. The main streets were on either side of the silo. The houses were nondescript but many of them had elaborate Christmas decorations year-round, like electrically lit plastic Santas and elves. There was a strong Mexican presence, though by no means a majority. I remember visiting a quilting fair (or something similar) in the high school. I also remember going into a bar and watching some folks play whist. When I asked how it was played, I was told, "Well, the highest card is an ace, see, and then comes the king, and then the queen, and then the jack . . ."
Memories being what they are, Conesville may differ markedly from my recollection. But the satellite image of it below confirms it, as does the population (according to the 2000 census): 424.