Mankind has settled into the numerous rocks and small moons of the Jovian system in various amounts, including the leading and trailing Trojans. Due to the high magnetic and radioactive nature of Io’s position in the Jovian system, as well as its tectonic instability, it has never been colonized, and only nominally explored by anything other than robotic probes.

Capital of the Jovian Federation, a loose collection of the nation-worlds that orbit Jupiter, and home to the Jovian Senate. Its population equals about 1.5 billion people, and has strict population growth controls. Cities are located under the kilometer thick ice. Considered to be among the Solar System’s best tourist traps due to the unusual city planning and it’s aquatic biosphere, which is varied, abundant, and completely non-terrestrial.

The largest of Jupiter’s moons. Ganymede is home to approximately 2 billion people, almost all of whom live beneath the ice, like on Europa. Unlike Europa, the enclosed ocean has very little indigenous life. Considered the breadbasket of the Jovian System, most of the food and industrial production is located here.

The latest large Jovian moon to be colonized, Callisto’s population live largely underground in subterranean domes. The domes have only the top part of their structure exposed to let in light and allow access to the rest of the city. No work has been done to give Callisto a livable atmosphere due to its small size, gravity, and high ice content. Most of the population has come to accept this fact. Callisto’s current population is at about 1 billion.