CWCountyWikiIndependent guide to local servicesCalifornia directory
County government

Contra Costa 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)

Contra Costa County — reported website; PDF page 4

Website: https://www.contracosta.ca.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)

Contra Costa county section; PDF page 4

Contra Costa

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

Source-reported contacts

Telephone

(925) 655-2075

Source & saved evidence

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

Contra Costa County — Telephone; PDF page 4

(925) 655-2075

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

Address

1025 Escobar Street, 4th Floor, Martinez, CA 94553

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)

Contra Costa County — Address; PDF page 4

1025 Escobar Street, 4th Floor, Martinez, CA 94553

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

Hours as listed

Monday through Friday 8 am to 5 pm

Source & saved evidence

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

Contra Costa County — Business Hours; PDF page 4

Monday through Friday 8 am to 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
Treasurer-Tax Collector

Find property tax bills, payment options and tax collection services. Find the local office for a business license or business tax certificate. Check the business activity and place covered by each service.

County government · Source checked October 12, 2026
Conservation & Development — Building Permits

Find building permits, plan review and construction inspections.

County government · Source checked October 14, 2026

County building permits and inspections for unincorporated Contra Costa and Clayton, Hercules, Lafayette, Moraga and Orinda. Planning approvals within those cities remain with the city or town.

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
Clerk of the Board — Assessment Appeals

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

County government · Source checked October 15, 2026
Conservation & Development — Solid Waste and Recycling

Find material-specific recycling, reuse and disposal resources.

County government · Source checked October 15, 2026

Collection oversight covers portions of unincorporated Contra Costa County; use the county recycling service directory to confirm the provider for an address.

Contra Costa County Child Support Services

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

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

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

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

Emergency preparedness, local alert programmes and official evacuation information.

County government · Source checked October 15, 2026
Contra Costa — 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
Contra Costa County Health – Behavioral Health Services

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

County government · Source checked October 16, 2026

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