Library branches are libraries that form part of a library system but are not located in the same area, building or city, but use the same Library classification for their catalogs and are interconnected with all the branches of the system that form part of the systems and to library patrons through a integrated library system.
Most of counties of every country have their own library system that usually have between to 20 libraries on every city of their counties, some of them are; London Public Library (on Canada) with 16 library branches, Helsinki Metropolitan Area Libraries with 63 libraries,National Library of Venezuela with 685 branches.
Some popular library branches includ New York Public Library Main Branch, part of New York Public Library System, and Martin Luther King Jr. Memorial Library, a branch of District of Columbia Public Library System.