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Please Note: as of July 1, 2016 our office closes at 4:00 PM on Wednesdays.

The Sonoma County Assessor's Office is open Monday, Tuesday, Thursday and Friday from 8 a.m. to 5 p.m. Wednesdays from 8 a.m. to 4 p.m. Please note our holiday schedule below.

Si necesita assistencia en EspaƱol favor de llamar a la oficina (707) 565-6075 entre las 8:00 a.m. y 5:00 p.m. de Lunes a Jueves.

The Sonoma County Clerk 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 accessibility assistance, please visit our Accessibility Assistance Information page.

Email • Correo Electrónico

Email William F. Rousseau assessor@sonoma-county.org
Email regarding Business Property eFile Questions. BusinessProperty@sonoma-county.org

Telephone Numbers • Números de Teléfono

(707) 565-3010 24 Hour Information Line (IVR)
(707) 565-1888 Assessor Main Office: Information
(707) 565-6075 Se habla Español (Lunes a Jueves)
(707) 565-3317 Assessor Main Office: Fax
(800) 244-1034 Assessor Main Office: Toll Free in Sonoma County
(707) 565-1330 Assessor Business Property: Information
(800) 797-4707 Assessor Business Property: Toll Free in Sonoma County
(707) 565-2861 Aircraft Assessments
(707) 565-2844 Boat Assessments
(707) 565-1888 Real Estate Assessments

2017 Holidays Observed: Offices Closed • Las Feriados Observados

Monday, Jan 2

New Year's Day - Observed

Monday, Jan 16

Martin Luther King, Jr. Day

Monday, Feb 13

Lincoln's Birthday

Monday, Feb 20

Presidents' Day

Monday, May 29

Memorial Day

Tuesday, July 4

Independence Day Holiday

Monday, Sept 4

Labor Day

Friday, Nov 10

Veteran's Day

Thursday, Nov 23

Thanksgiving Day

Friday, Nov 24

Day after Thanksgiving

Monday, Dec 25

Christmas Day

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.