Get a Library Card PLEASE NOTE: We want to thank you for your support and patience as we continue to evaluate and adjust our operations due to COVID-19. Currently, all of our library buildings are closed. San Mateo County Libraries will continue to accept online library card registrations and send the physical card in the mail. Thank you for your continued cooperation and understanding during this time. We look forward to welcoming you back to our Libraries soon. Your browser does not support iframes.