County of Sonoma, California
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Registrar of Voters


You may return your voted ballot to a drop-off location.


Cloverdale Veterans Memorial Building
205 West First Street, Cloverdale
Cotati Veterans Memorial Building
8505 Park Avenue, Cotati
Guerneville Veterans Memorial Building
First & Church Street, Guerneville
Healdsburg City Hall
401 Grove Street, Healdsburg
Petaluma Veterans Memorial Building
1094 Petaluma Boulevard, South, Petaluma
* Sonoma County Registrar of Voters
535 Fiscal Drive, Santa Rosa, CA 65403

Rohnert Park-Cotati Library
6250 Lynne Conde Way, Rohnert Park
Santa Rosa Veterans Memorial Building
1351 Maple Avenue, Santa Rosa
Sebastopol Veterans Memorial Building
282 South High Street, Sebastopol
Sonoma Veterans Memorial Building
126 First Street West, Sonoma
Windsor Town Hall
9291 Old Redwood Highway, Building 400, Windsor

DO NOT return voted ballots to locations other than the date/time listed above; there will be no authorized staff to accept them.

About The Registrar Of Voters

William F. Rousseau, Sonoma County Clerk-Recorder-Assessor

I am honored to serve you as Sonoma County’s Clerk-Recorder-Assessor and I’m always interested in receiving your feedback and questions.

You’re invited to contact my office by email. Please visit our Contact Us page for our division office locations and telephone numbers.

William F. Rousseau
Sonoma County Clerk-Recorder-Assessor

The Registrar of Voters Office is a division of the County Clerk-Recorder-Assessor’s Department, under the direction of an elected County Clerk. The Registrar of Voters Office performs a range of election-related duties, in addition to other public services that increase citizen participation and education.

Mission Statement

The Sonoma County Registrar of Voters Office is committed to the following goals:

  • To provide the highest level of service to the voters of Sonoma County
  • To eliminate barriers to participation in the democratic process
  • To educate youth as to the importance of the democratic process
  • To provide assistance to candidates, proponents and opponents of ballot measures and political jurisdictions in a fair and unbiased manner

Election-related Duties Include:

  • Conduct federal, state, and local elections held in Sonoma County
  • Register voters and maintain the voter registration file
  • Procure all polling places, and recruit all poll workers in Sonoma County
  • Provide information to candidates regarding the nomination process and campaign finance disclosure requirements
  • Maintain files of campaign committee financial statements (itemized listings of candidates’ and campaigns’ contributions and expenditures)
  • Provide voter registration information and related campaign materials to candidates and campaigns

Public Services Include:

  • Provide proof of registration upon request (for example, proof of residency or school residency verification)
  • Provide procedural guides to candidates and campaigns
  • Conduct office tours upon request by schools, civic groups and clubs interested in a "behind-the-scenes" view of elections
  • Conduct training for individuals or groups organizing a voter registration drive
  • Conduct training for poll workers and other Election Officials
  • Provide speakers for functions by groups desiring information about voter registration, the elections process, and how to become a poll worker

Business Hours for the Registrar of Voters Office

Monday through Friday, 8 a.m. to 5 p.m.

To Visit the County of Sonoma Registrar Of Voters Office:

435 Fiscal Drive
Santa Rosa, CA 95403

A drive thru Drop Box is available 24/7 for your convenience.

To Call the Registrar of Voters Office:

General Information:(707) 565-6800 Work
Toll Free:(800) 750-VOTE / (800) 750-8683 Work
TDD for hearing impaired:(707) 565-6888
Fax:(707) 565-6843 Work Fax

To Email the Registrar of Voters Office:

Voter Registration Information:
Vote by Mail Information:
Campaign Information:
Poll Worker Information:
Ordering maps and/or
Election Data:
General Information:

To Write to the Registrar of Voters Office:

Postal Address:
Sonoma County Registrar of Voters
P.O. Box 11485
Santa Rosa, CA 95406-1485
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