Formed in the year 1850, the county is located on the northern coast of the U.S. state of California. It is the largest (in area) and northernmost of the nine San Francisco Bay Area counties. It encloses 1,768.23 sq mi of area. It is domicile to more than 0.4 million people with rich admixture of races including White, Asian, African American, Hispanic or Latino of any race, Native American, Pacific Islander and others along with 0.17 households and 0.11 family units. Santa Rosa is the county seat and the largest city by area and population.

Sonoma County Index has made research process extremely easy and significant providing bountiful information and records in regard to birth and marital history, military service, liens and probates, civil war particulars, death reports, immigration details, court statistics, census, divorce decree information, property deeds, ancestral SSN and other facts. So, perform your research and collection invaluable genealogical facts about the individuals residing in this county.