This collection contains official records created or commissioned by the Sonoma County Board of Supervisors, including records of special districts in Sonoma County. Some records jointly created by the Sonoma County Administrator's Office.

This collection contains records of inquests cases investigated, 1872-1898, by the Sonoma County Coroner's Office. Collection includes an index created by the County Clerk/Coroner to inquests, 1915-1927 (inquests numbered 1-1364). Information in the index includes the decedent's name, address and age; date of death; Inquisition Docket reference; cause and nature of death; name of the investigator (Coroner or Deputy Coroner); and if an autopsy was performed, and its conclusions.

This collection contains materials recorded by the County Recorder related to marriage licenses in Sonoma County, California.