In what city does Scrooge have his business and does he live in the same town?

Scrooge's countinghouse is located in the city of London, the setting of many of the narratives of Charles Dickens.  The mention of St Paul's Cathedral in "A Christmas Carol" attests to this fact as well as Scrooge's comment after he speaks with his nephew in which Scrooge ponders the response of the young man to his question of why he married:  "I love her."  Scrooge thinks this answer foolish since his clerk who only makes 15 shillings a week telling Scrooge, his employer, to "have a Merry Christmas."  Scrooge then says, "I'll retire to Bedlam," a mental asylum in southeast London.  Certainly,  in a city the size of London, it was not uncommon for businessmen in the Victorian Age to live above or behind their shops if not near them since most people walked to work.

Of course, as narrator mentions London directly.  One such example is in Stave One where he describes Scrooge "taking his lonely meal":

It is also a fact, that Scrooge had seen it, night and morning, during his whole residence in that place; also that Scrooge had as little of what is called fancy about him as any man in the city of London, even including--which is a bold word--the corporation, aldermen, and livery.