National Register of Historic Places in Sonoma County
The Petaluma Free Public Library was established in 1878. The current Classical Revival building, designed by Brainerd Jones, was built in 1906 for $20,000. $12,500 was granted by Andrew Carnegie and the balance was donated by the Petaluma community.
The building remained a library until 1976 when it was renovated and converted into a museum of Petaluma history.
A Carnegie library was built in Santa Rosa in 1904, but it was demolished in 1964 to make way for a new library. You can still see it at its ominous, Romanesque best in Alfred Hitchcock's Shadow of A Doubt when Charlie visits the library at night and learns that her uncle might be the Merry Widow Murderer.
Some Carnegie Free Libraries in California
Some Other Carnegie Free Libraries in the West
The website Carnegie Libraries of California contains much information about these libraries.