The Agency is governed by a volunteer seven-member Library Board of Trustees with varying term lengths.
The Belvedere-Tiburon Library Agency was formed in April 1995 to establish an agency to construct, operate, and maintain a new public library convenient for the residents of Tiburon and Belvedere. The agency opened the Belvedere Tiburon Library in 1997 and currently serves Tiburon, Belvedere, and parts of Strawberry. The library provides basic library services to support a literate community. BTLA's mission is to provide free and equal access to knowledge, information, and ideas through the Library's resources and programs in a setting conducive to learning.