Without going into too much detail, Mario (generally) lives and works in the Mushroom Kingdom, one of the largest kingdoms—but not the only kingdom (see geo-political structures on Mushroom World [Super Mario Wiki, the Mario encyclopedia], in the Grand Finale Galaxy in, yes, the Mushroom Universe. read more
The top answer starts out: Without going into too much detail, Mario generally lives and works in the Mushroom Kingdom, one of the largest geo-political structures on Mushroom World, in the Grand Finale Galaxy in, yes, the Mushroom Universe. read more