• Homes in a Neighborhood

    Property value, ownership records and property information

  • Firefighters puting out fire -

    Disaster Relief

  • Operating Your Business

    Learn about Business Property Statements and who must file them

  • Property Information

    Farms, vineyards and ranches must file an annual Agricultural Business Property Statement

  • Russian River Valley

    Williamson Act

Welcome to the Assessor's Office

Proposition 19 Impacts

Voters passed Proposition 19 in November 2020. This legislation affects Parent-Child and Grandparent-Grandchild exclusions and Base Year Value Transfers. This legislation is currently being reviewed by the State Board of Equalization (BOE) for guidance and regulations. The Assessor’s Office will not be able to answer detailed questions about the legislation at this point in time. Visit the BOE’s Proposition 19 page for the most up to date information. 

Properties Affected by the 2020 Fires

Has your property suffered or been destroyed by the 2020 Fires? The Assessor's Office is here to help you during this difficult time.

It is important to know that you have 12 months from the event date to file the Calamity Damage Reassessment Form.

If you will be living somewhere else for an extended period of time, please fill out a Change of Mailing Address Form right away so that we can contact you if needed.

Please also check the Registrar of Voters page for information about updating your registration or mailing address for the November election.


Latest News

There are a variety of options available for lowering your property taxes. Each of these exemptions, exclusions or provisions has specific qualifications.

More about Property Tax Savings

California's property tax laws allow the Assessor to adjust assessed values due to a major calamity such as fire, earthquake, or flooding which damages or destroys your real or personal property.  

More about Disaster Relief

Temporary reductions to your property's taxable value on the Assessment Roll can be initiated by either you or the Assessor.

More about Temporary Decline in Market Value and how to apply

Machinery, equipment, tools, furniture, fixtures, and leasehold improvements held or used in connection with a trade or business are taxable. In addition, most boats, aircraft and mobile homes are also taxable. Supplies on hand, demonstration equipment, and construction in-progress are also assessable. 

More about Business Property taxes and filing


Deva Marie Proto

County Clerk-Recorder-Assessor-Registrar of Voters

Office Hours

Monday – Tuesday
9:00 AM – 1:00 PM
12:00 PM – 4:00 PM
Thursday – Friday
9:00 AM – 1:00 PM

Temporary Limited Hours

Note: Document processing and fee transactions end 30 minutes prior to closing


Assessor's Office

585 Fiscal Drive
Room 104F
Santa Rosa, CA 95403
38.4659106, -122.7251807

Electronic Filing

eFile Business or Agricultural Property Statement

Upcoming Filing Deadline: 6/1/2020 at 11:59 PM

eFile Your Property Statement

Login information from your 2020 Online Property Statement Filing Letter is required.

Flood Damaged Property

Search Parcel Numbers

Flood Update

Start by looking up the Assessor's Parcel Number (APN) with this tool using the full, or partial address

Change of Address and Authorization Forms

Download Forms

Property Value

Search Parcel Information

Sonoma County Property Value

Search current maps, parcel information, property values, change notices and more

Active Scams

Read About Current Scams

Scam Alert!

Active scams for services that are offered at our office for low or no cost!

Online Mapping

ActiveMap Viewer Collection
Access location-based information pertaining to a specific subject and/or area within unincorporated Sonoma County.

Fire Rebuild Operations

Assessment Appeals

About Assessment Appeals

Office of the Clerk of the Assessment Appeals Board

Assessment Appeals Calculator

The Assessment Appeals Board is an independent agency under the authority of the Sonoma County Board of Supervisors

Important Notice

Important Information 75x40The staff of the Clerk-Recorder-Assessor's Office are forbidden by California legal codes to practice law or provide legal advice; this prohibition includes giving advice about what forms you might need or how you should fill them out.