The State of Pennsylvania is divided by Commonwealth Libraries into 29 geographic regions called districts. Within each district, the State Librarian designates one strong library as the District Library Center. That library is then expected to provide supplementary library services to all local libraries within the district, make its resources available without charge to all residents of the district, coordinate the services of all local libraries, and exchange, provide, and contract for library services with other district library centers. All public libraries in the state are served by one of the 29 District Library Centers. Our district is the New Castle Library District and serves the libraries in Armstrong, Butler, Lawrence, and Mercer counties.  
Member Public Libraries of the New Castle Library District (*denotes non-state aided libraries)
Armstrong County: Independent Libraries
Mercer County: Independent Libraries