The Sonoma County Assessor's Office is open Monday through Friday, 8 a.m. to 5 p.m. Please note our holiday schedule below.
Si necesita assistencia en Español 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 Janice Atkinson. | assessor@sonoma-county.org |
|---|---|
| Email regarding Business Property eFile Questions. | BusinessProperty@sonoma-county.org |
| (707) 565-1888 | Assessor Main Office: Information |
|---|---|
| (707) 565-6075 | Información en 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 |
| Friday, Dec 31 | New Year's Day (County Holiday Observed) |
|---|---|
| Monday, Jan 17 | Martin Luther King Jr Day |
| Friday, Feb 11 | Lincoln's Birthday |
| Monday, Feb 21 | Presidents' Day |
| Monday, May 30 | Memorial Day |
| Monday, Jul 4 | Independence Day Holiday |
| Monday, Sep 5 | Labor Day |
| Friday, Nov 11 | Veteran's Day |
| Thursday, Nov 24 | Thanksgiving Day |
| Friday, Nov 25 | Day after Thanksgiving |
| Friday, Dec 23 - Jan 2, 2012 | This closure is due to a Mandatory Time Off program for employees, one of several cost savings measures adopted by the County to balance its budget and preserve essential services. |