Kuiper belt is a massive region that contains comets and asteroids. It is much larger than the Asteroid belt and is generally a place that hosts multiple celestial bodies such as dwarf planets. This region would serve to house a large population of people who traveled far. Light from the Sun is very dim and the small number of people that lives on the small worlds in the belt relies on geothermal energy for warmth.
Most worlds in the Kuiper Belt are very small and rocky. These worlds can, at most, hold about one thousand people. Most people in the Kuiper Belt are also apart of the lower classes. These classes are mostly apart of this region because of the vast region it takes up and the lack of interest many rich people would have in living in a region far from the Sun.