Lunar City is the central location for the various robots that live on Earth's moon. It is almost always the main setting of the entire series.
Built by Earth Command, Lunar City includes buildings such as a mall, a thug bar and it's most famous attraction, the Lunar Arena, where the Battle-Bots compete. It even has it's own law enforcement unit. The city's majority of its population are mainly Civi-Bots.
According to Blip, most of the residents are egotistical.