Funds for Gloucester County Library System services are provided by the member municipalities through a dedicated library tax. Of the 24 municipalities in Gloucester County, these 14 currently belong:
| Clayton | Harrison Township | S. Harrison Township |
| E. Greenwich Township | Logan Township | Swedesboro |
| Elk Township | Mantua Township | Woodbury Heights |
| Glassboro | National Park | Woolwich Township |
| Greenwich Township | Newfield |
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:
| Clarksboro | Mullica Hill | Swedesboro |
| Glassboro | Logan Township | |
| Gibbstown | Newfield |
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.