221B Baker Street is the fictional London residence of the detective Sherlock Holmes, created by author Arthur Conan Doyle. The address could indicate an upstairs apartment of a residential house on what was originally a Georgian terrace. The B of the address might, however, refer to the whole house. Baker Street is considerably wider than is portrayed in some film versions of Holmes's adventures and is a substantial and busy north-south thoroughfare, which is at least as congested now as it would have been in Holmes's day.
The site of the house — had it ever existed (see below) — has been much disputed by scholars. The address itself did not exist at the time the stories were first published.
The street number 221B has never been assigned to any property in Baker Street. In the period during which the Sherlock Holmes stories are set, street numbers in Baker Street only went up to No 100, which was presumably why Conan Doyle chose the fictional number.
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