The Ontario City Library collection contains audiovisual material (moving images, audio) and still images from the mid 1890s to the mid 1990s. The majority of the collection consists of oral histories and include subjects and topics such as automobiles, John S. Armstrong, the Long Beach Earthquake of 1933, Chaffey College, and more.
The Whittier Public Library History Room collection contains texts and audiovisual material (moving images and audio) from the 1900s to 1950s. A majority of the collection consists of Whittier Home Phone Directories. Other material includes filmed footage of the Whittier College Orchestra and building of the Whittier Library.