A cooperative service provided by the Public Libraries In Jefferson County, Alabama. A Cooperative Service Provided by the Public Libraries In Jefferson County, Alabama. The Jefferson County Library Cooperative dba Public Libraries in Jefferson County is a mission-driven, active partnership of libraries leveraging resource sharing, collaboration, innovation, and efficiency to create real impact and deliver best-in-class library service to our communities. Our Guiding Principles: * Fiscal responsibility * Equity in technology and system integration * Resource sharing and knowledge exchange * Professional development * Public library service and support * Sustainability