Founded in 1912, LA County Library is one of the largest and most innovative library systems in the US. It offers free public resources including books, music, multimedia materials, computer and internet access, and educational and recreational services to 3.4 million residents across 3,000 square miles through its 87 libraries and mobile fleet of 18 vehicles, including 3 bookmobiles, 10 MākMō maker mobiles, and 5 Reading Machines. LA County Library is dedicated to reducing barriers and increasing access to and equity of public services for all. To learn more, visit

Address: 145 N Walnut Ave San Dimas CA 91773
  • San Dimas Library is closed until further notice. Please use bookdrops for item returns.
  • Sidewalk Service holds pickup is available at this location Monday - Friday, 10 am - 5 pm.
  • Staff are available to answer questions via phone Monday – Friday, 9 am – 6 pm.
Phones: 909.599.6738