The Downey Historical Society is located at the Downey History Center in Apollo Park. For more than thirty years, the society's all-volunteer staff has been gathering and preserving records and artifacts from and about the southeastern part of Los Angeles County. The society's collection includes original photographs from 1870 to the present (copy negatives, duplicate prints, or 35-mm slides are…

Documents and photos relating to the history of the Crescenta Valley. The La Crescenta Valley Historical Society has a lot of materials on the New Years Flood of 1934, and the town of Montrose, plus some materials on the American portrait artist S. Seymour Thomas.

This collection is limited to material from, and relative to, the history of the Los Angeles Police Department. The collection consists of retired and replica police vehicles, a retired helicopter and police motorcycles. Uniforms, equipment and artifacts dating to the beginning of the LAPD are also held within the collection. The non-public archive houses annual reports, photos and motion picture…

The Mojave Desert Archives preserves the history of transcontinental travel to the Los Angeles region through the Mojave Desert of eastern California. Route 66, National Old Trails Road, the Mojave Wagon Road, the Santa Fe Railway (now BNSF), Union Pacific Railroad, and Interstate highways were and are major transit routes through the desert terminating in the Los Angeles basin.

The collections of the Pacific Palisades Historical Society deal with the history of Rancho Boca de Santa Monica; the Chautauqua movement; the Methodist community from 1921 to 1943; the Uplifters Club from 1921 to 1945; the Westside community of German émigrés from 1934 to 1943; Will Rogers; J. Paul Getty and the Parker Ranch; the film industry; beach culture; the now-nonexistent Bernheimer…

To share and make known the organization's significant archive and collections of San Fernando Valley history. SFVHS serves as caretaker of the Andres Pico Adobe historic site in Mission Hills as well as the Pioneer Cemetery in Sylmar.