To say that most Liverpool fans live in London assumes that you've travelled extensively around Britain. I doubt you've ever been to Liverpool. If however there are more Liverpool fans in London than Chelsea fans its probably becuase we're the significantly more successful club which means more media, more air time i.e More chance for a kid to grow to like a club - easy really.
Why, are you feeling a bit jealous or something ? You'll be saying we play route one football and are boring next just to add to your other predictable stereotypes. Can't wait for the one about Liverpool being the future French national team. Will you make it into the Champions League next season ?