County of Sonoma, California
Welcome to the Sonoma County Assessor's Office
The Assessor's Office is a division of the Clerk-Recorder-Assessor and is responsible for providing accurate and timely property assessments and for determining eligibility for various property tax exemptions and exclusions.
There are approximately 183,000 parcels of land in Sonoma County and the Assessor's Office is responsible for determining the assessed value of each parcel for property tax purposes in accordance with California's property tax laws. We currently have a staff of 64 who perform this complex, challenging, and rewarding job.
William F. Rousseau
Please Note: as of July 1, 2016 our office closes at 4:00 PM on Wednesdays.
2016-17 Assessed Value Notices are now available online. All you need to find your property value is your assessors parcel number or the property address. Look up your Assessed Value now or call the Assessor's Office for assistance at (707) 565-1888.
California's property tax laws provide a mechanism for the Assessor to adjust assessed values to recognize destruction caused by a calamity or misfortune which damages real or personal property. To qualify for a calamity adjustment the property must have suffered more than $10,000 worth of damage and the owner must file a claim form with the Assessor within 12 months of the date of the calamity. Calamities do not include damage which occurs over time such as termite damage, gradual earth movements or vineyard diseases such as phylloxera. There are slightly different rules that apply depending on whether the damage is caused by a widespread event that results in a Governor’s proclamation of disaster or by a specific misfortune such as flood, fire or landslide. Read more about the Calamity Damage Reassessment application provision...
Temporary reductions to your property's taxable value on the Assessment Roll can be initiated by either you or the Assessor. Use the links below for additional information and application forms.
Please note: If your property assessment was temporarily reduced as a "Decline in Value" property for 2015-16, you do not need to file another informal application for 2016-17. The next review will be initiated by the Assessor for properties in this category.
Please note: The June 30th, 2016 deadline to file a 2016-2017 Informal Request for Decline in Market Value Reassessment has passed. If you missed the June 30th deadline, you may protect your rights and ensure a review of the 2017 assessed value by filing a 2016-17 Assessment Appeal by November 30th, 2016.
Para Información en Español:
Si el valor de su propiedad fue reducido temporalmente como una "perdida de valor" en el año 2015-2016, no es necesario volver a aplicar para una reduccíon en el año 2016-2017. Nuestra oficina revisará estos valores automáticamente.
The Assessment Roll is a public document that lists property values and location information for all taxable real estate, business property and personal property in the county. Information we display here is current as of the most recently published Assessment Roll.
In an effort to provide more information to the public via the web, our office has placed the most recent Assessor's Parcel Maps in the "Search the Assessment Roll" section of our website. Once you locate the assessment data you are looking for, click on the "View Maps" link and the most recent assessor's parcel map should be available to download. Parcel maps available through this website are updated monthly.
Search the Sonoma County Assessment Roll now.
Assessment Information Available 24 hours a Day by Phone:
Try our IVR system to obtain assessment information any time of the day or night! By entering a valid parcel number you will receive the parcel's assessed values by assessment category (land, improvements, personal property, exemptions, and the net assessed value). If you request a fax-back, the fax will list not only the assessed values by category, but also the assessee, the assessee's mailing address, the parcel's situs address, and the parcel's tax rate area (TRA) code.
Get property information 24 hours a day, 7 days a week by using the interactive voice response and fax-back system by calling (707) 565-3010.
The Sonoma County Treasurer-Tax Collector is responsible for the collection of Secured Property Taxes, Supplemental Property Taxes and Unsecured Property Taxes.
Search property tax record information online by visiting the Sonoma County Treasurer-Tax Collector. You may also research Assessment and Tax information by calling the Tax Collector's office at (707) 565-2281.
Get property tax information 24 hours a day, 7 days a week by using the interactive voice response and fax-back system by calling (707) 565-3010.
ActiveMap is an Internet Interactive Mapping Application launched by the Permit and Resource Management Department on its public website. The geographic information service mapping and reporting application provides residents, businesses and visitors with mouse-click access to a variety of land development, location-based information for properties within the unincorporated [non-City] areas of Sonoma County. Use ActiveMap now.
The Sonoma County Assessor's Office is open Monday, Tuesday, Thursday, Friday from 8 a.m. to 5 p.m. and Wednesdays from 8 a.m. to 4 p.m.
Please send all mail to:
The Sonoma County Assessor uses the Section 508 standards as guidelines for pages within our website. We are actively engaged in the ongoing process of testing, developing, and updating our website for compliance with these accessibility standards. If you have a disability, and need assistance, please visit our Accessibility Assistance Information page.
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Important Notice: The 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.