This collection contains records of cases heard in the County Court for Sonoma County, California, between 1850 and 1880. Includes record of civil and criminal cases heard in County Court, daily records of County Court operations, and records of cases on appeal.

This collection contains reporters' transcripts and related papers for cases brought before the Third District Court of Appeal between 1909 and 1922.

This collection contains registers and minutes of criminal cases brought before the Court of Sessions.

This collection contains records reflect various aspects of the operations of the Sonoma County District Courts. These include: registers of actions in civil and criminal cases heard in the District Court, and fees paid; liens for state and county taxes; lists of defendents and plaintiffs; minutes of each court session, court actions, and rules of the court.

This collection contains records of the Probate Court concerning wills and other matters of probate. Records include index to surety bonds, bond on sale of real estate, bond of guardian upon qualifying, bond of administrator and executor.