CWCountyWikiIndependent guide to local servicesCalifornia directory
County government

Sonoma County

County government

Website listed by the source directory (opens in a new tab)
Source & saved evidence

California Secretary of State · 2026 California Roster — County Officials (opens in a new tab)

Sonoma County — reported website; PDF page 25

Website: https://sonomacounty.gov/

Agent source review: October 13, 2026 · Snapshot 88eef089319b69ca

What is covered

Roster fields are self-reported by local jurisdictions; officeholders and election districts are not imported.

Source & saved evidence

California Secretary of State · 2026 California Roster — County Officials (opens in a new tab)

Sonoma county section; PDF page 25

Sonoma

Agent source review: October 13, 2026 · Snapshot 88eef089319b69ca

Source-reported contacts

Telephone

(707) 565-2431

Source & saved evidence

California Secretary of State · 2026 California Roster — County Officials (opens in a new tab)

Sonoma County — Telephone; PDF page 25

(707) 565-2431

Agent source review: October 13, 2026 · Snapshot 88eef089319b69ca

Address

575 Administration Drive, Room 104A, Santa Rosa, CA 95403

View address on map (opens in a new tab)

Source & saved evidence

California Secretary of State · 2026 California Roster — County Officials (opens in a new tab)

Sonoma County — Address; PDF page 25

575 Administration Drive, Room 104A, Santa Rosa, CA 95403

Agent source review: October 13, 2026 · Snapshot 88eef089319b69ca

Hours as listed

8 am-5 pm

Source & saved evidence

California Secretary of State · 2026 California Roster — County Officials (opens in a new tab)

Sonoma County — Business Hours; PDF page 25

8 am-5 pm

Agent source review: October 13, 2026 · Snapshot 88eef089319b69ca

Reviewed office guides

Assessor

Find property assessments, parcel information and property tax exemptions.

County government · Source checked October 12, 2026
Clerk-Recorder

Find recorded documents, recording requirements and certified copies. Find marriage licensing and county clerk services. Find fictitious business name (FBN / DBA) filing and renewal instructions. Business licenses are a separate service.

County government · Source checked October 12, 2026
Auditor-Controller-Treasurer-Tax Collector

Find property tax bills, payment options and tax collection services.

County government · Source checked October 12, 2026
Permit Sonoma

Find building permits, plan review and construction inspections. Find zoning maps and official property land-use information.

County government · Source checked October 14, 2026

Unincorporated Sonoma County, outside its nine incorporated cities.

County Elections Office

Find voter registration, ballots, voting locations and local election information.

County government · Source checked October 14, 2026
Social Services

Find food assistance, cash benefits and support for children, adults and families. County Medi-Cal eligibility services for applications, renewals and case changes.

County government · Source checked October 14, 2026
Public records requests

Find government records, request instructions and the agency that holds them.

County government · Source checked October 14, 2026
Assessment Appeals Board — Clerk of the Board

Assessment appeals board function; provider and jurisdiction must be verified.

County government · Source checked October 15, 2026
Sonoma County Child Support Services

County or regional child support agency; case administration, parentage, orders and payment assistance.

County government · Source checked October 15, 2026
Sonoma County Veterans Service Office

Local help with veteran claims, benefits, college fee waivers and referrals.

County government · Source checked October 15, 2026
Sonoma County IHSS — in-home support

County IHSS programme guides, with recipient assessment separate from provider enrollment and payroll.

County government · Source checked October 15, 2026
Sonoma — Emergency alert guide

Emergency preparedness, local alert programmes and official evacuation information.

County government · Source checked October 15, 2026
Sonoma — Adult Protective Services guide

County programmes responding to suspected abuse, neglect and exploitation of older and dependent adults in the community.

County government · Source checked October 15, 2026
Sonoma County Economic Development Collaborative — licensing guidance

Find the right local authority and check whether a license or another permit is needed.

County government · Source checked October 16, 2026
Sonoma County Department of Health Services — Behavioral Health

County mental health service information and access contacts. Providers assess eligibility and current care arrangements.

County government · Source checked October 16, 2026

Sonoma county mental health plan referral; individual eligibility is assessed by the provider