The San Mateo County Libraries (SMCL), formerly San Mateo County Library, is a public library system and Joint Powers Authority headquartered in San Mateo, California. Its motto is "Open for Exploration".
It is a member of the Peninsula Library System. It serves the smaller cities of San Mateo County who do not have a city library.
The following locations are a part of the system:
The bookmobile service travels around the county to various locations like schools, post offices, and even the Hiller Aviation Museum.