Larger than 200 miles in diameter
All known bodies in the solar system with a diameter of over 200 miles.
This includes trans-Neptunian objects with cool names like Ixion. Note the size of Titan in relation to Mercury.
You might be wondering, since Eris is bigger than Pluto, how come it is not Planet Ten? The answer: Planet Ten is where the red lectroids come from: Pluto, or Yoggoth on the Rim (as she is known among the Servants of the Great One), is infested with the living Fungi of Mi-Go, and maybe even Shuma-Gorath and Dagon; and besides, the three-eyed Wormface aliens have a military base there, the brain-eaters of Pluto, and many other species. Inhabited by these august entities, how dare we not call it a planet?
Anyone who says otherwise is a Pluto-hater.
(Now, if we can all agree to call Pluto a Dwarf Planet, that is fine with me, provided we rename it Khazad Dum.)