The source record
A functioning Census entity.
The Census ACTIVE field is Y for this record.
- Census ID
- 161097
- Record type
- General-purpose government
- Classification
- County
- Status
- Functioning
U.S. Census government inventory · ID 161097
County of Contra Costa.
General-purpose government in California · Census county area: Contra Costa.
General-purpose governmentCountyFunctioning
Published contact fields
Contact and location
Mailing address651 PINE ST, RM 108A · MARTINEZ, CA · 94553-1229
Census contact/title fieldChairman
County areaContra Costa
Reported websiteOpen reported website ↗
Websites are primarily self-reported and received only limited Census Bureau quality control. County area can mean the area most served or the headquarters county when boundaries cross counties.
Official 2026 California roster
Current public officials reported by the jurisdiction
COUNTY DIRECTORY
View source page 4 ↗Contra Costa
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
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. Election.org 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
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.