An address directory is a collection or publication of names and addresses in a given area that lists entries by location rather than by name. They are useful for identifying the past and present owners and occupants of a location when only the address is known.
Real estate and marketing firms and people conducting historical or genealogical research make extensive use of address directories. Online examples include directories such as PeopleSmart.com and YellowPages.com that contain searchable databases that allow users to search for people by address. Polk City Directories are good examples of printed versions of these directories. Address directories are also frequently available in local or municipal offices, such as town halls or county administration buildings, and in local libraries.