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Government directory/California
2025 Census government inventory

County of Contra Costa

General-purpose government in California. Browse the source-reported information below.

Census ID 161097 · Census county field: Contra Costa · Functioning in the 2025 inventory
Names, roles & contact channels

Published local officials

4 source-linked entries for Contra Costa County, compiled by CivicPatch. Each entry keeps the source's update date and government links.

A dated roster, not a live verification. We matched this jurisdiction to its exact Census identifier. Continued service, complete seat coverage, and your individual district representative have not been independently verified. Check the linked government source before contacting an official.

Candace Andersen

  • Supervisor, District 2Published term: 2024-03 – end not listed

Source updated

Government profile ↗Government profile ↗
View government sources (4)

Diane Burgis

  • Supervisor, District 3Published term: 2024 – end not listed

Source updated

Government profile ↗Government profile ↗Email: supervisor_burgis@bos.cccounty.usPublished phone: (925) 655-2330
View government sources (4)

John M. Gioia

  • Supervisor, District 1

Source updated

Government profile ↗
View government sources (3)

Ken Carlson

  • Supervisor, District 4Published term: 2022-11-08 – end not listed

Source updated

Government profile ↗Government profile ↗
View government sources (4)
Audit the exact CivicPatch snapshot ↗Data license ↗Imported 2026-10-02. Import date is not a new source-verification date.
The source record

Listed as functioning in 2025.

The Census ACTIVE field is Y for this record.

Census ID
161097
Record type
General-purpose government
Classification
County
Status
Functioning
2025 Census snapshot

Reported contact and location fields

Reported mailing address651 PINE ST, RM 108A · MARTINEZ, CA · 94553-1229
Reported contact roleChairman

A role label, not a verified person’s name.

Census county fieldContra Costa
Reported websiteOpen listed website ↗

These are inventory fields, not newly verified office contacts. A county field or mailing address does not establish the exact service boundary.

Official 2026 California roster

Current public officials reported by the jurisdiction

Open CalRoster source ↗
COUNTY DIRECTORY

Contra Costa

View source page 4 ↗

Governing board and executive

County Supervisor — District 1John Gioia
County Supervisor — District 2Candace Andersen
County Supervisor — District 3Diane Burgis
County Supervisor — District 4Kent Carlson
County Supervisor — District 5Shanelle Scales-Preston

Records and elections

Clerk of the BoardJami Morritt
County Clerk-RecorderKristin B. Connelly
Registrar of VotersName not reported

Finance and property

AssessorGus Kramer
Auditor-ControllerRobert Campbell
Treasurer/Tax CollectorDan Mierzwa

Public safety and justice

Chief Probation OfficerEsa Ehman-Krause
District AttorneyDiana Becton
Fire ChiefLewis Broschard
Public DefenderEllen McDonnell
Sheriff-CoronerDavid O. Livingston

Administration

County AdministratorMonica Nino
County CounselThomas Geiger

Education and libraries

County LibrarianAlison McKee
Superintendent of SchoolsLynn Mackey

Judicial leadership

Presiding JudgeChristopher Bowen
Assistant Presiding JudgeJoni T. Hiramoto

Other public officials

Behavioral HealthCybthia Belon
Chief Administrative OfficerDavid Twa
Child Support Services DirectorMatthew Brega
Community Development DirectorJohn Kopchik
Social Services DirectorMarla Stuart
Health Care Services DirectorAnna Roth
Human Resource DirectorAnn Elliott
Information Technology DirectorMarc Shorr
Public Works Agency DirectorWarren Lai
Phone(925) 655-2075Address1025 Escobar Street, 4th Floor, Martinez, CA 94553Jurisdiction websitehttps://www.contracosta.ca.gov/ ↗

The CalRoster labels county entries elected and appointed officials and does not publish a selection method for each individual role. The source compiler therefore does not infer elected or appointed status from the title alone. The Secretary of State notes that each local jurisdiction supplies its own roster data; this is a dated public record, not a live officeholder feed.

Published context

Scale and parent relationship

Population estimate1,155,0252023

About these sources and their limits
Evidence boundary

What each source proves—and what it does not.

Established by the published records

  • The entity or system appears in the 2025 Census listing.
  • Its Census category, identifier, and functioning/dormant field.
  • Only the location, function, population, enrollment, and contact fields actually published.
  • The separate 2026 CalRoster reports the public-official roles and holder text shown above.

Not established by these records

  • Whether each governing or administrative role is elected, appointed, or mixed.
  • The exact geographic service boundary or that a reported website remains current.
Nearby in the government graph

Related California entities

All California records →
GENERAL-PURPOSE GOVERNMENTCity of AntiochContra Costa county areaGENERAL-PURPOSE GOVERNMENTCity of BrentwoodContra Costa county areaGENERAL-PURPOSE GOVERNMENTCity of ClaytonContra Costa county areaGENERAL-PURPOSE GOVERNMENTCity of ConcordContra Costa county areaGENERAL-PURPOSE GOVERNMENTCity of El CerritoContra Costa county areaGENERAL-PURPOSE GOVERNMENTCity of HerculesContra Costa county area
Reading guideLocal government
How to interpret this record

County of Contra Costa, CA — 2026 Public Officials

Local government is a collection of institutions with different boundaries and responsibilities. A municipality, school district and special district can serve overlapping places without being the same organization.

Map the institution, not just the city name

A mailing address can sit inside several governmental boundaries. A county, municipality, school district and special-purpose body may each make different decisions. The Census of Governments provides a structured way to identify governmental units; a unit’s existence does not automatically tell you who currently holds each seat or when its next election occurs.

Distinguish a directory from a live roster

An institutional directory describes organizations. An official roster describes people connected to offices at a stated time. These sources may be published by different agencies on different schedules. Electionpedia links the institution and the person when the evidence supports a match, while preserving the distinction between the source’s reference year and the latest date the file was checked.

Read the full local government guide →