The Diamond Bar Library serves about 53,857 residents in Diamond Bar City, Los Angeles County. Founded in 1977, the library occupies an 18,245-square-foot building that has spaces for children and teens, 11 public computers, laptops & hotspot kits, and four early learning computers. The Diamond Bar Library maintains collections of books and DVDs in English, Chinese, Hindi, Korean, and Spanish for kids and adults, the Los Angeles Times, and a variety of Overdrive, Freegal music, and Hoopla streaming online resources. About 4.8 million volumes are maintained in the library, which also circulates over 14.1 million items annually.

The library, which opened its doors in 1977, is housed in an 18,245 square foot structure with rooms for kids and teenagers, 11 public computers, laptops & hotspot kits, and four early learning PCs.
The Los Angeles Times, a range of Overdrive, Freegal music, and Hoopla streaming online resources, as well as collections of books and DVDs in English, Chinese, Hindi, Korean, and Spanish for children and adults are all available at the Diamond Bar Library.
The library houses about 4.8 million volumes and circulates approximately 14.1 million items annually.