This collection contains records of flood control projects in Sonoma County undertaken by the Sonoma County Flood Control and Water Conservation District in Forestville; Graton; Hyland Acres; Healdsburg; Petaluma; Santa Rosa; Occidental; Russian River; South Park; Spring Creek and Sonoma Valley.

This collection contains records produced by the North Bay Health Systems Agency, a multi-member health care planning agency for Napa, Solano and Sonoma counties.

This collection contains records relating to land use in Sonoma County, including extensive maps, aerial photographs, environmental impact data and files relating to the Outer Continental Shelf Program.

This collection contains records pertaining to the operations of the Petaluma Police Court, including lists of jurors

This collection contains ledgers listing misdemeanor cases handled through the Recorder's Court, by the Petaluma City Recorder. Recorder's court docket records spanning the early twentieth century. These are primarily handwritten volumes, although some were typewritten.

This collection contains a large number of volumes that derive from the operations of the Petaluma Small Claims Court in Petaluma, Sonoma County, California

This collection contains records of cases brought before the Recorder's Court of the City of Santa Rosa, California.

This collection contains audits of various County departments and divisions.

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