I have to confess at being mystified by some maps that showed Hutt Space being even bigger than the Galactic Empire, though. That never made any sense seeing as how Palpatine's realm was supposed to encompass a huge chunk of that galaxy with Coruscant being at the center of the Empire in much the same way it was at the heart of the Old Republic.
Were those New Jedi Order
-era maps? By that time the Empire has shrunk to twelve sectors, so it would be smaller than the Hutt claims.