- Hayward Area Historical Society The society's library includes materials on San Lorenzo and other areas neighboring Hayward.
- Oakland Library History Room The Oakland History Room at the main library contains an extensive collection of materials on East Bay history. The website has a searchable catalog of the collecton.
- San Leandro Library History Room The library's collection of historic photographs has been digitized and is available for viewing from your own computer.
- San Lorenzo Library The oldest library in Alameda County, it has a strong collection in local history and genealogy.