The indexing of Sonoma County newspapers was undertaken to help fill in the gaps in some of the early records in Sonoma County. The first volume, which covers the period from 1854 through 1875 was published early in 2001. Eleven additional volumes have been published between that time and the present, covering the period through 1921.

The present volume contains an index of surnames found in those papers published in Sonoma County between 1922 and 1924 and contains 12, 898 entries. Other volumes are planned for the future. Some of the entries include residents from the surrounding counties of Marin, Napa, Solano, Lake, and Mendocino.