San Mateo County Libraries have been an integral part of its diverse community for over a century. Originally established by the San Mateo County Board of Supervisors in 1912 as a County Free Public Library, the San Mateo County Library Joint Powers Authority (JPA) was established in 1999. The Library JPA is comprised of the cities of Atherton, Belmont, Brisbane, East Palo Alto, Foster City, Half Moon Bay, Millbrae, Pacifica, Portola Valley, San Carlos, Woodside, and the unincorporated areas of the county. The Library JPA is a separate, independent entity with its own Governing Board, consisting of elected officials from each member entity. An Operations Committee composed of City and County representatives from each member entity also provides guidance.

San Mateo County Libraries are incomparable destinations for learning and growth. Each of our twelve libraries is part of a larger family offering worlds of discovery and technological opportunities. More than 160,000 community members or 62 percent of the service population have library cards, and more than two million people visit us in person annually.