County Clerk-Recorder-Assessor

I am honored and excited to be serving as your County Clerk-Recorder-Assessor. Our office provides so many core vital services to the public and we believe in the importance of doing so fairly, efficiently and with great customer service.
I look forward to building on the successes we have had in the past, while embracing many future improvements.
Deva Marie Proto
Assessor
The Assessor’s Office is responsible for providing accurate and timely property assessments and for determining eligibility for various property tax exemptions and exclusions.
Clerk-Recorder
The County Clerk's Office issues marriage licenses, filing fictitious business name statements, processing notary bonds, handles environmental documents, and performs civil marriage ceremonies. The County Clerk Division also issues certified copies of marriage, birth and death records on behalf of the County Recorder.
The Recorder's Office maintains various land and finance documents for Sonoma County. Typical land documents include deeds, leases, mining claims, subdivision maps, homestead declarations and records of survey. Typical finance documents include trust deeds, notices of default, reconveyances, and various liens. This division of the Clerk-Recorder-Assessor also collects the Documentary Transfer Tax when real property exchanges hands.
Upcoming Events
County Holidays
March 4, 2026
Sonoma County Historical Records Commission to recognize four at Collections and Archives ceremony
The Sonoma County Historical Records Commission today announced four recipients of its fifth annual Collections and Archives Recognition Awards. These awards recognize the accomplishments and contributions of individuals, groups, agencies, collections, or archives located within Sonoma County and focus on existing collections as well as recognizing special efforts to preserve and use archival material in promoting history and cultural preservation.
February 2, 2026
Sonoma County Clerk-Recorder-Assessor to host Secretary of State for third Apostille Pop-Up Shop
August 19, 2025
July 1, 2025
Sonoma County achieves record-high net assessment roll of more than $127 billion
Additional Information
Office Location Map
Download a PDF map of our office locations with our hours and the services we offer!
Important Notice
Resources
Important Forms
Sonoma County Fire Recovery
Start by looking up the Assessor's Parcel Number (APN) with this tool using the full, or partial address
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