The Gloucester County Library System (GCLS) is a group of individual and interdependent libraries that cooperate through a central administrative body to provide a wide range of library services for eligible patrons. Sharing resources enables members of the system to provide more cost-effective and technologically sophisticated services than any could provide operating alone.

The GCLS staff is responsible to a five-member library commission, which is appointed by the Gloucester County Board of County Commissioners. Funds for system services are provided by the member municipalities through a dedicated library tax. Of the 24 municipalities in Gloucester County, these 14 currently belong:

All residents of these communities have free access to the full services of the Gloucester County Library System through libraries located in the following towns:

Library cards are issued without charge to residents of the 14 participating communities; nonresident owners of property in a member community; not-for-profit organizations within Gloucester County; educators teaching in Gloucester County; county department heads; and those holding elected/appointed positions in county, state, or federal government.