Pennsylvania Library Systems
- Adams County Library System
- Allegheny County Library Association
- Beaver County Library System
- Bedford County Library System
- Berks County Public Libraries
- Blair County Library System
- Bradford County Libraries
- Bucks County Library Network
- Butler County Federated Library System
- Cambria County Library System
- Centre County Federation of Public Libraries
- Chester County Library System
- Clarion County Library System
- Crawford County Library System
- Cumberland County Library System
- Delaware County Library System
- Franklin County Library System
- Greene County Library System
- Jefferson County Library System
- Library System of Lancaster County
- Lawrence County Library System
- Lebanon County Library System
- Luzerne County Library System
- Lycoming County Library System
- Potter-Tioga County Library System
- Schuylkill County Library System
- Somerset County Federated Library System
- Union County Library System
- Washington County Library System
- Public Libraries of Wayne County
- Westmoreland County Federated Library System
- York County Library System