San Diego County Library's Bonita-Sunnyside Branch serves the 12,500 residents of Bonita from its single-story facility on Bonita Road near Sweetwater Road. The branch shares Bonita's cultural-institution corridor with Bonita Museum & Cultural Center, and both venues anchor community programming for the 91902 ZIP code. Part of the San Diego County Library system — a network circulating 6.9 million items annually across 33 branches — the Bonita-Sunnyside location offers physical and digital collections including e-books, audiobooks, streaming media, and a 3D-printing station for patron prototyping projects. The Friends of the Bonita-Sunnyside Library operates a used bookstore inside the building, with proceeds funding author visits, summer reading incentives, and equipment upgrades. Homework-help and literacy resources draw students from nearby campuses such as Bonita Vista Middle School, and the branch's reservable study room provides quiet workspace for exam preparation. Community-room programming rotates through yoga, Tai Chi, Lego-building workshops, and bilingual story times that reflect the demographic range of the Sweetwater Valley.