• Russian River Valley

    Preserving agricultural and open space lands

  • Business Brewery

    File a Business Property Statement

  • Vessel Property

    File a Vessel Property Statement

  • Horse Property Statements

    File a Horse Property Statement

Assessor Forms

Important Notice

Important Information 75x40The deadline to file a 2018-2019 Informal Request for Decline in Market Value Reassessment was June 30th, 2018. If you missed the June 30th deadline, you may protect your rights and ensure a review of the 2018 assessed value by filing a 2018-19 Assessment Appeal by November 30th, 2018.

Please Note Important Filing Deadlines

Some forms have specific deadlines to file, others can be filed any time during the year or must be filed within a set number of days past an event.

If there is not a specific deadline listed below, please refer to the form instructions, information page, or contact our office for assistance.

eFile Business Property Statement

eFile Your Property Statement

The deadline to file your 2018 Business Property Statement has passed. The deadline was Monday, May 7th at 11:59 PM. The 2019 Notice to File letters will be mailed February 2019.

Revenue and Taxation Code section 441(b)

Form NameFormDeadline

Informal Request for Decline in Market Value Request

More Information

SCAO 341June 30 

Value Decline Frequently Asked Questions

More Information

SCAO 337N/A 

Prop 8 Preguntas mas Frecuentes

SCAO 337 N/A


William F. Rousseau

County Clerk-Recorder-Assessor-Registrar of Voters

Business Hours
Monday – Tuesday
8:00 AM – 5:00 PM
8:00 AM – 4:00 PM
Thursday – Friday
8:00 AM – 5:00 PM

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

Deadline to File Business Property Statements Passed

eFile Your Property Statement

The deadline was 5/7/2018. We will mail the 2019 Notice to File letters February 2019.

Assessment Appeals

Assessment Appeals Forms

Assessment Appeals Calculator

Assessment Appeals forms are available through the Assessment Appeals Board.

Property Value

Search Parcel Information

Sonoma County Property Value

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

Online Mapping

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

Active Scams

Read About Current Scams

Scam Alert!

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

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.