About San Mateo County

Population 764,000 residents
County Seat Redwood City
Municipalities 20 Cities & Towns

San Mateo County is located in the San Francisco Bay Area of California, occupying the central portion of the San Francisco Peninsula. The county seat is Redwood City, situated at 400 County Center, Redwood City, CA 94063. With a population of approximately 764,000 residents across 449 square miles of land area, San Mateo County ranks as one of the most populous and affluent counties in California. The county stretches from the San Francisco city limits in the north to Santa Clara County in the south, bounded by the Pacific Ocean to the west and the San Francisco Bay to the east.

400 County Center, Redwood City, CA 94063

Major landmarks include the Pacific Coast Highway (Highway 1), Crystal Springs Reservoir, San Bruno Mountain State Park, and numerous coastal beaches including Half Moon Bay. Incorporated in 1856, San Mateo County has evolved from agricultural ranching lands to become a global technology and innovation hub. The county encompasses 20 incorporated cities including Daly City, San Mateo, Burlingame, Millbrae, San Bruno, South San Francisco, Pacifica, Foster City, Belmont, San Carlos, Redwood City, Menlo Park, Atherton, Woodside, Portola Valley, Colma, Brisbane, Half Moon Bay, Hillsborough, and East Palo Alto.

What makes San Mateo County unique is its position at the epicenter of Silicon Valley innovation, housing numerous Fortune 500 company headquarters and venture capital firms, while maintaining agricultural heritage along the coastal Coastside communities. Key county offices include the San Mateo County Recorder-Clerk at 555 County Center, 1st Floor, Redwood City, CA 94063; the County Assessor-Chief Deputy Clerk-Recorder at the same address; and the County Controller's Office managing financial records.

Sheriff, Police & Law Enforcement

Sheriff & Law Enforcement

The San Mateo County Sheriff's Office is responsible for law enforcement in the unincorporated areas of the county, as well as managing the county jail system. The office also processes arrests and maintains criminal records. It offers various programs, including community policing initiatives and a search and rescue team. The Sheriff's Office plays a crucial role in ensuring public safety and operates specialized divisions such as the Narcotics Task Force and the Gang Intelligence Unit, which address specific criminal activities within the county.

Police Departments

San Mateo County is served by several law enforcement agencies, including the San Mateo County Sheriff's Office and municipal police departments such as the Daly City Police Department, San Mateo Police Department, and South San Francisco Police Department. Each city department is responsible for law enforcement within its jurisdiction, handling local crimes, traffic enforcement, and community policing. These agencies collaborate on major crimes and emergencies, often coordinating with the Sheriff's Office for resources and support in larger investigations.

Law Enforcement & Arrests

The San Mateo County Sheriff's Office, headquartered at 400 County Center, Redwood City, CA 94063 (phone: 650-363-4911, website: https://www.smcsheriff.com), serves as the primary law enforcement agency for unincorporated areas and provides countywide services including jail operations, court security, and civil process. The Sheriff's Office operates the Maguire Correctional Facility and Maple Street Correctional Center for adult detention.

  • Inmates can be located through the Sheriff's online Inmate Locator system at https://www.smcsheriff.com/inmate-locator, which provides booking information, charges, bail amounts, and projected release dates.
  • Citizens may request arrest records by submitting written requests to the arresting agency, though certain information may be withheld under exemptions in Government Code Section 6254(f) for ongoing investigations.
  • The Sheriff's Office typically charges per-page copying fees as authorized under Government Code Section 6257.
400 County Center, Redwood City, CA 94063 • Phone: 650-363-4911

Municipal police departments serve the incorporated cities: Daly City Police Department, San Mateo Police Department, Burlingame Police Department, Millbrae Police Department, San Bruno Police Department, South San Francisco Police Department, Pacifica Police Department, Redwood City Police Department, Menlo Park Police Department, Atherton Police Department, Brisbane Police Department, and Half Moon Bay Police Department, while smaller cities contract with the Sheriff's Office for law enforcement services. Arrest records in San Mateo County are public records subject to disclosure under the California Public Records Act (Government Code Section 6250 et seq.). Mugshots and booking photos are generally available through the Sheriff's online inmate locator system for currently incarcerated individuals, and historical booking photos can be requested through formal public records requests.

No tribal police jurisdictions exist within San Mateo County, though the California Highway Patrol maintains significant presence on Interstate 280, Highway 101, and State Route 1.

Criminal, Arrest & Jail Records

Criminal Records

The criminal records ecosystem in San Mateo County includes felony, misdemeanor, traffic violations, and sex offender registry records. The San Mateo County Sheriff's Office and local police departments maintain these records. Background checks can be conducted through the California Department of Justice, which provides comprehensive criminal history information for residents. The California Bureau of Investigation also plays a role in maintaining statewide criminal records, which are accessible to law enforcement and authorized agencies for investigative purposes.

Arrest Records

Arrest records in San Mateo County are maintained by the San Mateo County Sheriff's Office and the various municipal police departments within the county. Residents and attorneys can request arrest records by contacting the respective law enforcement agency. These records typically include the individual's name, date of arrest, charges, and booking details. The California Public Records Act governs the accessibility of these records, ensuring transparency while protecting sensitive information.

  • Requests for arrest records can be made in person, by mail, or through online portals provided by the agencies.

Jail & Inmate Records

The Maguire Correctional Facility is the primary jail facility in San Mateo County. It handles the booking process for individuals arrested in the county, where they are fingerprinted, photographed, and assessed for bail eligibility. The facility provides an inmate lookup service through the county's official website, allowing the public to search for current detainees. Visitation rules are specific to the facility, requiring visitors to schedule appointments and adhere to strict guidelines.

  • In California, the bail process involves posting a bond through a bail bondsman or paying the full bail amount to secure the release of an inmate pending trial.

Mugshots & Booking Photos

Mugshots in San Mateo County are taken and retained by the San Mateo County Sheriff's Office during the booking process. These booking photos are part of the public record and can be accessed through the sheriff's official website or by submitting a request to the office. California law does not mandate the removal of mugshots from public records, but individuals can petition for removal if the charges are dropped or if they are found not guilty. Third-party websites may also host mugshots, but their removal policies vary.

Courts & Case Records

The Superior Court of California, County of San Mateo, serves as the unified trial court handling all civil, criminal, family law, probate, juvenile, and traffic matters. The court operates multiple facilities with the main courthouse located at 400 County Center, Redwood City, CA 94063 (phone: 650-261-5000, website: https://www.sanmateocourt.org). Additional court locations include the South San Francisco Branch at 400 Grand Avenue, South San Francisco, CA 94080, and a traffic division.

  • More detailed document access requires in-person visits to the Records Section at the Hall of Justice, 400 County Center, 1st Floor, Redwood City, with copies charged at $0.50 per page for standard documents.
400 County Center, Redwood City, CA 94063 • Phone: 650-261-5000
400 Grand Avenue, South San Francisco, CA 94080

Following California's court unification in 1998, municipal and justice courts were consolidated into the Superior Court system. The court maintains jurisdiction over all criminal felonies and misdemeanors, civil cases exceeding $25,000 in controversy, family law proceedings including dissolution and custody, probate and conservatorship matters, juvenile delinquency and dependency cases, small claims up to $10,000, and traffic infractions. Court records can be searched through the court's online case access system at https://www.sanmateocourt.org/online_services, which provides free access to basic case information including party names, case numbers, filing dates, and hearing schedules.

California Rules of Court Rule 2.500 through 2.507 govern public access to court records, implementing the constitutional right of access established in California Constitution Article I, Section 3(b)(1). Certain records are sealed or confidential by statute, including juvenile dependency records (Welfare & Institutions Code Section 827), mental health proceedings, and records subject to protective orders. Electronic filing is mandatory for represented parties under California Rules of Court Rule 2.253, with exceptions for self-represented litigants.

Property & Public Records

The San Mateo County Recorder-Clerk, located at 555 County Center, 1st Floor, Redwood City, CA 94063 (phone: 650-363-4500, website: https://recorder.smcgov.org), maintains official land records dating back to the county's 1856 formation. The Recorder's Office records and preserves documents affecting real property titles including grant deeds, quitclaim deeds, deeds of trust, reconveyances, mortgage assignments, mechanics liens, judgment liens, easements, covenants, conditions and restrictions (CC&Rs), subdivision maps, parcel maps, and notices of default.

  • Documents recorded before 1976 require in-person or mail research requests.
  • Certified copies cost $11 for the first page plus $3 for each additional page of the same document, with standard non-certified copies available at reduced rates.
  • Recording fees are $0 for non-assessable real property conveyances as of recent California legislative changes, though various services fees apply.

The office provides free online access to recorded documents from 1976 forward through the Official Records Search portal at https://recorder.smcgov.org/official-records-search, allowing users to search by document number, recording date, grantor/grantee names, and Assessor's Parcel Numbers (APNs). The San Mateo County Assessor-Clerk-Recorder-Chief Elections Officer, located at the same address (phone: 650-363-4988, website: https://assessor.smcgov.org), maintains property tax assessment rolls, ownership records, and exemption information. The Assessor's online Property Search application at https://assessor.smcgov.org/property-search provides free access to current assessed values, ownership information, property characteristics, tax rates, and sales history.

The county's comprehensive GIS parcel viewer at https://gis.smcgov.org integrates mapping data with property records, zoning information, and environmental overlays. Under California Government Code Section 27322-27361, the County Recorder must maintain a grantor-grantee index and accept legally compliant documents for recording.

Vital Records

Vital records for San Mateo County residents are maintained by the San Mateo County Clerk-Recorder's Office at 555 County Center, 1st Floor, Redwood City, CA 94063 (phone: 650-363-4500, website: https://recorder.smcgov.org). Birth certificates for births occurring in San Mateo County from July 1905 forward can be requested in person, by mail, or through the county's online ordering partner with fees of $28 for the first certified copy and $14 for each additional copy of the same record ordered simultaneously.

  • Processing times are typically 10-15 business days for mail requests and immediate for in-person walk-in service during business hours.
  • Death certificates for deaths occurring in San Mateo County cost $21 for the first certified copy and $14 for each additional copy, available through the same channels with similar processing times.
  • Divorce records (Marriage Dissolution Decrees) are maintained by the Superior Court of California, County of San Mateo, not the County Clerk, and must be requested through the court at 400 County Center, Redwood City.
  • Online ordering through approved vendors like VitalChek is available for expedited service with additional convenience fees.

Requesters must provide valid photo identification and demonstrate eligibility under California Health and Safety Code Section 103526, which restricts certified copies to authorized persons including the registrant, immediate family members, legal representatives, and persons with court orders. Marriage licenses must be obtained in person by both parties at the County Clerk's Office, with the completed marriage certificate available after the ceremony is performed and returned for recording at a cost of $17 per certified copy. Confidential marriage licenses, authorized under California Family Code Section 500, are also available and remain sealed from public inspection.

The California Department of Public Health Vital Records Office in Sacramento serves as the statewide repository and can provide certified copies of any California vital record for events from 1905 forward at https://www.cdph.ca.gov/Programs/CHSI/Pages/Vital-Records.aspx.

Business & Licensing

Business licensing and registration in San Mateo County operates through multiple jurisdictional levels. Individual cities issue most business licenses and permits, requiring businesses operating within city limits to contact the respective city clerk or finance department for local licensing requirements.

  • FBN filings cost $26 for the first business name plus $10 for each additional name filed simultaneously, and must be renewed every five years.
  • This free online search provides entity status, registration dates, agent for service of process, and entity numbers.
  • The California Department of Tax and Fee Administration issues seller's permits for businesses collecting sales tax.
555 County Center, Redwood City, CA 94063 • Phone: 650-363-4500

The San Mateo County Clerk-Recorder at 555 County Center, Redwood City, CA 94063 (phone: 650-363-4500) accepts Fictitious Business Name (FBA) statements, commonly called "Doing Business As" (DBA) filings, required under California Business and Professions Code Section 17900 when individuals or entities operate under a name other than their legal name. After filing, businesses must publish the FBN statement in a qualified newspaper of general circulation for four consecutive weeks and file an affidavit of publication with the County Clerk. The California Secretary of State maintains the statewide business entity database at https://bizfileonline.sos.ca.gov for corporations, limited liability companies, limited partnerships, and other registered business entities.

Professional licenses for doctors, contractors, real estate agents, and other regulated professions are issued by respective California state licensing boards, searchable at https://search.dca.ca.gov. Building permits, planning approvals, and zoning compliance in unincorporated San Mateo County are handled by the Planning and Building Department at 455 County Center, 2nd Floor, Redwood City, CA 94063 (phone: 650-363-1825). The San Mateo County Economic Development Association (SAMCEDA) at https://www.samceda.org serves as a regional resource for business development, site selection, and economic data.

Elections & Voter Records

Elections in San Mateo County are administered by the Registration & Elections Division of the Assessor-County Clerk-Recorder office, located at 40 Tower Road, San Mateo, CA 94402 (phone: 650-312-5222, website: https://www.smcacre.org/elections). The office oversees all aspects of federal, state, and local elections including voter registration, candidate filings, ballot preparation, vote-by-mail processing, polling place operations, and results certification.

  • California voters can register online at https://registertovote.ca.gov up to 15 days before any election, with conditional voter registration available through Election Day at the Elections Office or any vote center.
  • Same-day conditional voter registration allows eligible citizens to register and vote provisionally during the 14-day period before and including Election Day once their registration is processed.
  • California Election Code Section 9082-9094 governs public access to election materials, ensuring transparency in the electoral process while protecting voter privacy through California Constitution Article II provisions.
40 Tower Road, San Mateo, CA 94402 • Phone: 650-312-5222

Registration requires U.S. citizenship, California residency, at least 18 years old by Election Day, and not currently serving a state or federal prison term for felony conviction. San Mateo County voters can verify their registration status, find their polling location or vote center, and access sample ballots at https://www.smcacre.org/voter-information or through the California Secretary of State's voter portal.

San Mateo County has transitioned to the Voter's Choice Act model, establishing vote centers that allow any county voter to cast their ballot at any location during an extended voting period beginning 10 days before Election Day. All registered voters automatically receive vote-by-mail ballots for every election under California law, which can be returned by mail (postmarked by Election Day), at official drop boxes throughout the county, or at any vote center. Public election records include voter registration rolls (with addresses redacted for public access per Elections Code Section 2188), campaign finance disclosure statements filed by candidates and committees viewable at https://www.smcacre.org and the California Fair Political Practices Commission website, candidate statements, nomination documents, precinct-level election results, and election materials archives.

San Mateo County consistently demonstrates high voter engagement, with the November 2024 general election achieving approximately 76% turnout of registered voters, reflecting strong civic participation in this politically active region. The next major election is scheduled for November 3, 2026, featuring U.S. House of Representatives races for California's 15th and 16th Congressional Districts (covering San Mateo County), the U.S.

Senate seat, California Governor, statewide constitutional officers, State Assembly and Senate seats, Superior Court judges, and local municipal offices and measures.

Economy & Demographics

San Mateo County's economy ranks among the most prosperous in the United States, with a median household income exceeding $128,000, significantly above state and national averages. The county's economic foundation rests on technology, biotechnology, financial services, healthcare, and professional services sectors.

As a core component of Silicon Valley, San Mateo County hosts headquarters and major facilities for numerous Fortune 500 companies and technology leaders including Oracle Corporation (Redwood City), Genentech/Roche (South San Francisco), Electronic Arts (Redwood City), Visa Inc. (Foster City), GoPro (San Mateo), Sony Interactive Entertainment (San Mateo), SurveyMonkey (the county), Gilead Sciences facilities, and extensive operations from Meta/Facebook, Google, and other tech giants particularly in Menlo Park and Burlingame. The biotech corridor along the Bayfront, particularly in South San Francisco known as "Birthplace of Biotechnology," concentrates pharmaceutical research and biomanufacturing facilities.

San Francisco International Airport, though primarily in San Mateo County territory, serves as a major employer and economic engine generating billions in regional economic impact. The technology sector dominates with software development, cloud computing, artificial intelligence, venture capital investment, and semiconductor operations. Major employers also include healthcare systems like Kaiser Permanente, Seton Medical Center, and Mills-Peninsula Medical Center.

Coastal communities maintain agricultural operations including pumpkin farms, Christmas tree farms, flower cultivation, and organic vegetable production, particularly around Half Moon Bay and Pescadero. Tourism contributes significantly through coastal recreation, the annual Half Moon Bay Art & Pumpkin Festival, state beaches, and the Ritz-Carlton Half Moon Bay resort. The county's unemployment rate historically tracks below state and national averages, typically ranging 2-4% during economic expansion periods.

Recent economic development initiatives focus on life sciences cluster expansion, transportation infrastructure improvements including Caltrain electrification and potential High-Speed Rail connections, affordable housing development to address critical shortages, and sustainability programs. The county's proximity to San Francisco, Stanford University, and San Jose creates synergistic innovation ecosystems.

Transparency Score

Court Records: ✅ Online | Property: ✅ Free Search | Arrest/Jail: ✅ Online | Vital Records: ✅ Online Ordering | Business: ✅ Online | Elections: ✅ Online | Overall Score: 9.5/10 — San Mateo County provides exceptional digital access to virtually all public records with robust online portals, searchable databases, and comprehensive transparency tools exceeding most California counties.

Official Government Resources

Frequently Asked Questions

How can I search for someone recently arrested in San Mateo County, California?
To search for someone recently arrested in San Mateo County, you can use the inmate search feature on the San Mateo County Sheriff's Office website. The Maguire Correctional Facility is the primary jail in the county where arrestees are held. You can access the inmate lookup tool online by visiting the Sheriff's Office section dedicated to inmate information. This tool allows you to search by name or booking number to find current inmates and their booking details.
Mugshots or booking photos in San Mateo County are typically managed by the San Mateo County Sheriff's Office. While these photos are part of public records, they may not be readily available online due to privacy laws. You can request access to these records by contacting the Records Division of the Sheriff's Office directly. It's important to note that the availability of such records may be subject to certain restrictions under California law.
To obtain a criminal background check in San Mateo County, you need to contact the California Department of Justice (DOJ), which handles statewide background checks. Locally, you can visit the San Mateo County Sheriff's Office to request fingerprinting services, which are required for the DOJ background check process. The results will include criminal history information specific to California and are typically used for employment, licensing, or personal review purposes.
You can look up sex offenders in San Mateo County by accessing the California Megan's Law website, which is the official state registry. This online database allows you to search for registered sex offenders by name, address, or proximity to a specific location. The website provides detailed information about each offender, including their offenses and current status, helping residents stay informed about their community.
You can register to vote in San Mateo County through the California Secretary of State's online portal at https://registertovote.ca.gov or by submitting a paper application to the San Mateo County Registration & Elections Division at 40 Tower Road, San Mateo, CA 94402 (phone: 650-312-5222). The registration deadline is 15 days before any election, though California offers conditional voter registration through Election Day at the Elections Office or any vote center. Once registered, you will automatically receive vote-by-mail ballots for all elections, and you can request replacement ballots or find vote center locations at https://www.smcacre.org.
Property records in San Mateo County can be searched through two primary offices: the County Recorder-Clerk at https://recorder.smcgov.org for recorded documents like deeds, mortgages, and liens (free search available from 1976 forward), and the County Assessor at https://assessor.smcgov.org for property tax assessments, ownership information, and sales history (completely free). Both offices are located at 555 County Center, Redwood City, CA 94063. The county's GIS parcel viewer at https://gis.smcgov.org integrates property boundaries, zoning, and environmental data. Certified copies of recorded documents cost $11 for the first page plus $3 per additional page.
Birth and death certificates for events occurring in San Mateo County are available from the County Clerk-Recorder's Office at 555 County Center, 1st Floor, Redwood City, CA 94063 (phone: 650-363-4500, website: https://recorder.smcgov.org). Birth certificates cost $28 for the first certified copy and death certificates cost $21, with additional copies available at reduced rates. You can order in person for same-day service, by mail with 10-15 business day processing, or online through authorized vendors for expedited delivery. Valid photo identification and proof of eligibility under California Health and Safety Code Section 103526 (immediate family member, legal representative, or authorized person) are required.
Business licenses in San Mateo County are primarily issued by individual cities, so you should contact the city clerk or finance department where the business operates. For Fictitious Business Name (DBA) statements filed in San Mateo County, contact the County Clerk-Recorder at 650-363-4500 or visit 555 County Center, Redwood City. For corporations, LLCs, and other registered business entities, search the free California Secretary of State database at https://bizfileonline.sos.ca.gov. Professional licenses can be verified through California state licensing boards at https://search.dca.ca.gov.