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What is the deep lore of Retroville? How about the location:
They clearly live in the United States and the suffix of -ville is most commonly popular in the American South. Retroville being in the American South is further reinforced in the Episode 'Jimmy on Ice,' where Jimmy accidentally plunges the city into an Ice Age with -9000 sunblock. Many of the citizens lack winter clothing, and don't know how to react to the suddenly cold weather, as if they've never experienced it. Judging by the geography of the region, it's fairly flat and temperate with vegetation, so it can be narrowed down that Retroville is more than likely in Eastern Texas, inland, as there are no notable nearby rivers or oceans.