Final answer:
The Grinch lives on Mount Crumpit in the story 'How the Grinch Stole Christmas'.
Step-by-step explanation:
In the story How the Grinch Stole Christmas, the Grinch lives on a mountain that is named Mount Crumpit. This mountain overlooks the town of Whoville, where all the Whos live, and it is from there that the Grinch hatches his plan to steal Christmas from the Whos. It is a key location in the story, as the Grinch's isolation on the mountain reflects his separation from the community and the joy of the holiday that he eventually learns to embrace.