The source record
A functioning Census entity.
The Census ACTIVE field is Y for this record.
- Census ID
- 123088
- Record type
- General-purpose government
- Classification
- County
- Status
- Functioning
U.S. Census government inventory · ID 123088
County of San Mateo.
General-purpose government in California · Census county area: San Mateo.
General-purpose governmentCountyFunctioning
Published contact fields
Contact and location
Mailing address400 COUNTY CTR · REDWOOD CITY, CA · 94063-1668
Census contact/title fieldDeputy County Manager
County areaSan Mateo
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 21 ↗San Mateo
Governing board and executive
County Supervisor — District 1Jackie Speier
County Supervisor — District 2Noelia Corzo
County Supervisor — District 3Ray Mueller
County Supervisor — District 4Lisa Gauthier
County Supervisor — District 5David Canepa
Records and elections
Finance and property
Public safety and justice
Chief Probation OfficerJohn Keene
District AttorneySteve Wagstaffe
Fire ChiefNate Armstrong
Sheriff-CoronerChristina Corpus
Administration
County CounselJohn Niblbelin
Education and libraries
County LibrarianAnne-Marie Despain
Superintendent of SchoolsNancy Magee
Judicial leadership
Presiding JudgeStephanie G. Garratt
Assistant Presiding JudgeRachel Holt
Other public officials
Behavioral HealthColleen Chawla
Child Support Services DirectorKim Cagno
Community Development DirectorEmma Gonzalez
Emergency ServicesShruti Dhapodkar
Health Care Services DirectorColleen Chawla
Human Resource DirectorRocio Kiryczun
Information Technology DirectorMichael Wentworth
Public Works Agency DirectorAnn Stillman
Phone(650) 363-4123Address400 County Center, Redwood City, CA 94063Jurisdiction websitehttps://www.smcgov.org/ ↗
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 estimate726,3532023
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.