Contra Costa County is on the northeastern side of San Francisco Bay, forming the northern half of the East Bay region. With roughly 1.15 million residents, it is California's ninth most populous county. The county has one of the most internally diverse profiles in the Bay Area — Richmond and San Pablo on the western shoreline are lower-income working-class communities with above-average court filing rates; Walnut Creek, Concord, and the Lamorinda communities (Lafayette, Moraga, Orinda) in the central county are solidly middle and upper-middle class; Brentwood, Oakley, and Antioch in the eastern county are among the Bay Area's fastest-growing suburban communities driven by housing-cost outmigration from the inner East Bay.
California has no unified statewide court portal. Contra Costa County Superior Court maintains its own case access system at cc-courts.org. The eastern county's rapid growth means many current Brentwood, Oakley, and Antioch residents have prior Alameda County or Contra Costa western county records that are more substantive than their current-address court history. For broader California context, see our California state guide.
Key takeaways
- Contra Costa County has approximately 1.15 million residents (U.S. Census Bureau, 2023 ACS) — California's ninth most populous county with no statewide portal; cc-courts.org is the county-specific access point.
- The county has four courthouse locations (Martinez, Richmond, Walnut Creek, Pittsburg) serving different geographic areas — all accessible through the same online portal but relevant to document retrieval routing.
- Eastern Contra Costa County (Antioch, Brentwood, Oakley) has experienced rapid growth from Bay Area outmigration — Alameda County Superior Court is the standard prior-county supplement for subjects who relocated from Oakland or inner East Bay.
- Richmond and San Pablo have significant Latino communities — Spanish-language surname variant checking is standard for western county name searches.
Contra Costa County quick facts
- Population estimate (2023): approximately 1,150,000 (U.S. Census Bureau, 2023 ACS)
- County seat: Martinez
- Largest city: Concord (est. pop. 130,000)
- State: California
- Primary court: Contra Costa County Superior Court (four courthouse locations)
Population estimates from the U.S. Census Bureau.
How to search Contra Costa County records
Run cc-courts.org and supplement with Alameda County for eastern county subjects
Contra Costa County Superior Court at cc-courts.org is the county-specific portal for all case types — criminal, civil, family, and probate. California has no unified statewide portal; each Superior Court is county-specific. The cc-courts.org portal covers all four Contra Costa courthouse locations simultaneously in a single name search, which is efficient for the county's geographically spread population. For subjects in eastern Contra Costa — Antioch, Brentwood, Oakley — the standard supplement is Alameda County Superior Court at alameda.courts.ca.gov. Eastern Contra Costa's rapid growth is substantially driven by Bay Area housing cost outmigration from Oakland, Berkeley, and inner Alameda County. For subjects who relocated east within the past five to ten years, prior Alameda County records may be far more substantive than their Contra Costa history. Our court record search guide covers how California's county-specific portal structure differs from states with unified statewide access.
Apply Spanish name-variant awareness for Richmond and San Pablo searches
Richmond and San Pablo on the western bay shoreline have significant Latino populations — Richmond has an approximately 35% Latino population, and the Richmond-San Pablo corridor is one of the more densely Latino communities in the Bay Area outside of San Jose and Los Angeles. Spanish naming conventions apply in both directions: two-surname forms may be used in official documents but not in everyday use, and vice versa. Running both the single common-use surname and the full two-surname legal form before concluding no record exists is the standard approach for Richmond name searches. Vietnamese and African American names are also common in Richmond and require broader initial search variants before narrowing. Our find someone by first and last name guide covers systematic variant search strategies for diverse urban communities.
Identify the prior Bay Area county from the aggregator before selecting portals
Contra Costa County's internal geographic range — from industrial Richmond to affluent Lamorinda to fast-growing eastern communities — means prior-county supplements vary significantly by where in the county the subject currently lives. For western county (Richmond, San Pablo, El Cerrito) subjects, prior addresses may be in Alameda County or San Francisco County. For central county (Concord, Walnut Creek) subjects, prior addresses are most often in Alameda County or other Contra Costa communities. For eastern county (Antioch, Brentwood, Oakley) subjects, prior Alameda County records are the most common and substantive supplement. Running the aggregator to identify the full Bay Area address chain before selecting portals is the most efficient approach for any Contra Costa search. Our find someone by name and city guide covers how to build this chain systematically.
Official record sources in Contra Costa County
| Record type | Agency | Online access | Notes |
|---|---|---|---|
| Felony, misdemeanor, civil, family, probate | Contra Costa County Superior Court | cc-courts.org | County-specific portal. All four courthouse locations (Martinez, Richmond, Walnut Creek, Pittsburg) searchable in one name query. California privacy rules restrict access for domestic violence, juvenile, and civil harassment cases. |
| Bay Area supplement — prior Oakland/East Bay records | Alameda County Superior Court | alameda.courts.ca.gov | Standard supplement for eastern Contra Costa subjects who relocated from Oakland or inner Alameda County. Prior records stay in Alameda County system — do not migrate to Contra Costa when someone moves. |
| Property records | Contra Costa County Assessor / Clerk-Recorder | ccassessor.com and ccclerk.org | Assessor for ownership and assessed value. Clerk-Recorder for deeds and liens. Most reliable current-address source for homeowners in Walnut Creek, Concord, and the Lamorinda communities. |
| Marriage and vital records | Contra Costa County Clerk-Recorder / California CDPH | ccclerk.org and cdph.ca.gov/vital-records | County Clerk-Recorder for local vital records including marriage licenses. CDPH statewide marriage index from 1905. Certified copies by mail or in person. |
| Arrest and booking records | Contra Costa County Sheriff / city police departments | cocosheriff.org | Sheriff covers county jail, unincorporated areas, and some contract cities. Richmond PD, Concord PD, Antioch PD, and other city departments maintain separate arrest records. |
| State prison records | California CDCR — CIRIS | cdcr.ca.gov/ciris | CIRIS (2023) covers current CDCR inmates and recent releases statewide. Separate from county jail records. |
For a broader overview of how public records are aggregated across jurisdictions, see our public record search guide.
Marriage records in Contra Costa County
Marriage licenses in California are issued by the county clerk where the license is obtained. The Contra Costa County Clerk-Recorder issues and records marriage licenses at ccclerk.org. California CDPH maintains a statewide marriage index from 1905 forward — certified copies by mail through cdph.ca.gov/vital-records or VitalChek.
Contra Costa County's Latino community in the western county creates marriage record name-variant considerations similar to the court record searches described above. For a full guide to how marriage record searches work across all states, see our marriage record search guide.
Divorce records in Contra Costa County
Divorce cases in California are filed in Superior Court in the county of residence. Contra Costa County Superior Court handles dissolution filings for county residents, with case indexes at cc-courts.org. California requires six months of state residency and three months of county residency before filing. Full documents require in-person access or a formal records request at the relevant courthouse.
The Bay Area outmigration pattern means some Contra Costa dissolution filings involve parties who moved to Contra Costa from Alameda County mid-proceedings. Divorce records stay in the county where the petition was filed. For a full guide to how divorce record searches work across all states, see our divorce record search guide.
Industry insight
The Bay Area outmigration pattern is the most consistent operational issue in Contra Costa County. Antioch, Brentwood, and Oakley have grown substantially because Bay Area housing prices pushed residents east — but those residents' prior records stayed in Oakland, Berkeley, or inner Contra Costa. A Contra Costa-only search for someone who moved from Oakland three years ago looks thin because their record history is in Alameda County. I always run Alameda alongside Contra Costa for any eastern county subject. The two portals together cover the complete Bay Area picture.
Richmond is the other consistent challenge. The Richmond name-variant issue is similar to what I encounter in East Oakland or South San Jose — Spanish surnames in two-surname form may appear differently than the single-surname form in different records systems. Running both surname forms, checking the aggregator for relative names that anchor the correct form, and verifying the date of birth before narrowing results are the standard steps for any Richmond search involving common Spanish surnames.
Common mistakes when searching in Contra Costa County
- Running only Contra Costa County for eastern county subjects — Antioch, Brentwood, and Oakley have grown from Bay Area outmigration. Subjects who relocated from Oakland or inner Alameda County within the past decade have prior Alameda County records that are often more substantive than their Contra Costa history. Always run Alameda County alongside Contra Costa for eastern county subjects.
- Not applying Spanish name-variant awareness for Richmond and San Pablo searches — Richmond's Latino community uses two-surname conventions that produce different record forms across different systems. Running both single-surname and two-surname forms before concluding no record exists is standard for Richmond name searches.
- Treating the cc-courts.org clean result as a complete California picture — California's expungement provisions are active, and California has no unified statewide portal. Prior San Francisco County or Solano County records from earlier Bay Area residences require those counties' separate portals.
- Missing the courthouse division routing for document retrieval — all four courthouse locations (Martinez, Richmond, Walnut Creek, Pittsburg) are in the same online search system, but documents are at the courthouse that handled the case. Western county criminal matters route to the Richmond courthouse; central county matters to Walnut Creek; eastern county criminal matters to Pittsburg; probate and family law to Martinez.
Contra Costa County court system overview
Contra Costa County Superior Court is a single unified trial court operating across four courthouse locations. The main courthouse in Martinez handles probate, family law, and administrative matters. The Richmond courthouse serves western county criminal and civil matters. The Walnut Creek courthouse serves central county civil and family matters. The Pittsburg courthouse serves eastern county criminal matters. All four are searchable through cc-courts.org in a single name query — the courthouse location matters for document requests and in-person access, not for the online search itself.
Crime statistics and public-safety context
Contra Costa County has strongly bifurcated crime rates. Richmond consistently ranks among the Bay Area's highest violent crime cities — comparable to parts of Oakland in per-capita violent crime rate. San Pablo is similarly elevated. Walnut Creek, Orinda, Danville, and the Lamorinda communities have crime rates among the lowest in California for cities of their size. Eastern Contra Costa — Antioch, Pittsburg — has above-average property crime for the Bay Area. California Department of Justice, Crime in California 2023 data showed Contra Costa County's aggregate violent crime rate near the statewide average, with Richmond driving most of the county's serious crime volume.
Major cities in Contra Costa County
Concord
Concord (est. pop. 130,000 — U.S. Census Bureau, 2023 ACS) is the county's largest city and a central East Bay hub with a diverse demographic profile. Concord has a mix of longtime working-class residents and Bay Area in-migrants. The Walnut Creek courthouse handles civil and family matters for central Contra Costa including Concord.
Richmond
Richmond (est. pop. 115,000 — U.S. Census Bureau, 2023 ACS) is on the Bay shoreline in western Contra Costa with a significant Latino and African American community. Richmond generates the county's highest criminal court filing volume per capita. The Richmond courthouse handles western county criminal matters. Spanish-language surname variant checking is standard for Richmond name searches, along with Vietnamese name variant awareness.
Antioch
Antioch (est. pop. 118,000 — U.S. Census Bureau, 2023 ACS) is the largest eastern Contra Costa city and a primary destination for Bay Area outmigration. Many current Antioch residents have prior Alameda County or San Francisco County address histories. The Pittsburg courthouse handles eastern county criminal matters including Antioch cases.
Walnut Creek
Walnut Creek (est. pop. 70,000 — U.S. Census Bureau, 2023 ACS) is the commercial and professional services hub of central Contra Costa. The Walnut Creek courthouse handles central county civil and family matters. Very low criminal court filing rates relative to Richmond or Antioch.
Lamorinda communities (Lafayette, Moraga, Orinda)
The Lamorinda communities in the hills between Walnut Creek and Oakland are among the Bay Area's most affluent suburban communities. Court filing rates are among the lowest in the county. Many Lamorinda residents have long-tenure address histories and stable property ownership records that make current-address verification straightforward through the County Assessor.
Common search scenarios
Searching by name and city in Contra Costa County
Identify the specific part of the county — western (Richmond, San Pablo), central (Concord, Walnut Creek), or eastern (Antioch, Brentwood) — from the aggregator address. Run cc-courts.org for Contra Costa court records. For Richmond, apply Spanish and Vietnamese name variants. For eastern county, add Alameda County Superior Court. For the Lamorinda communities, property records at ccassessor.com are often more productive than court portal searches. See our guide on finding someone by name and city.
Checking Contra Costa County court records
cc-courts.org for Superior Court records → Alameda County Superior Court for prior East Bay records → Contra Costa County Assessor for property-based address verification → CDCR CIRIS for state prison context. See our court record search guide.
Searching for an eastern county subject who relocated from Oakland
Identify the prior Alameda County city from the aggregator address chain. Run Alameda County Superior Court at alameda.courts.ca.gov alongside cc-courts.org. The prior Oakland or Berkeley records may be far more substantive. A name and relative search through the aggregator typically surfaces the full Bay Area address chain before any portal work begins.
Start Here: Enter Any Name To View Records
Best sites to review first
Before navigating Contra Costa County's court portal, these are the two services I recommend reviewing first — particularly for building the Bay Area address chain and identifying which prior county supplements are needed.
| Service | Why people use it | Best fit |
|---|---|---|
| Instant Checkmate | Aggregates address history across Contra Costa's western, central, and eastern communities and surfaces prior Alameda County addresses for outmigration subjects | Bay Area address chain building and prior-county identification before portal selection |
| TruthFinder | Broader Bay Area address history including prior Alameda, San Francisco, and Solano county addresses for subjects with complex Bay Area residential histories | Expanded context for Bay Area mobile subjects with multi-county address histories |
Important: These services are not FCRA-compliant consumer reporting agencies. Do not use them for employment screening, tenant decisions, insurance underwriting, or any other purpose regulated by the Fair Credit Reporting Act.
Frequently asked questions
Does Contra Costa County have an online court records search?
Yes. Contra Costa County Superior Court at cc-courts.org provides online case access for criminal, civil, family, and probate matters. All four courthouse locations (Martinez, Richmond, Walnut Creek, Pittsburg) are searchable in a single name query. California has no unified statewide portal — each county maintains its own separate system. California privacy rules restrict remote access for domestic violence, juvenile, and some civil harassment cases.
Why should I check Alameda County for eastern Contra Costa searches?
Eastern Contra Costa communities — Antioch, Brentwood, Oakley — have grown substantially from Bay Area housing outmigration, primarily from Oakland and inner Alameda County. Prior records for these subjects remain in Alameda County's system — they do not migrate to Contra Costa when someone moves. For subjects who relocated to eastern Contra Costa within the past decade, Alameda County Superior Court at alameda.courts.ca.gov is the standard supplement that fills in the prior-period picture.
Where do I find marriage and divorce records for Contra Costa County?
Marriage licenses are issued by the Contra Costa County Clerk-Recorder at ccclerk.org. California CDPH maintains a statewide marriage index from 1905 forward — certified copies by mail through cdph.ca.gov/vital-records. Divorce records are in Contra Costa County Superior Court at cc-courts.org. Full documents require in-person access or a formal records request at the relevant courthouse division.
What courthouse handles records for different parts of Contra Costa County?
The online portal at cc-courts.org covers all four courthouse locations simultaneously — no pre-selection required. For document retrieval, the routing matters: Martinez courthouse handles probate and administrative matters; Richmond courthouse handles western county (Richmond, San Pablo, El Cerrito) criminal matters; Walnut Creek courthouse handles central county (Concord, Walnut Creek, Lamorinda) civil and family matters; Pittsburg courthouse handles eastern county (Antioch, Brentwood, Oakley, Pittsburg) criminal matters.
How do I find property records for Contra Costa County?
The Contra Costa County Assessor at ccassessor.com provides free online searches by owner name or address for ownership and assessed value. The Clerk-Recorder at ccclerk.org holds deeds and liens. The Assessor portal is particularly reliable for the Lamorinda communities and Walnut Creek where homeownership rates are high and addresses are stable.
How does California's expungement law affect Contra Costa County searches?
California Penal Code 1203.4 allows many misdemeanor and felony convictions to be dismissed after successful probation completion, and AB 1076 (2023) automated expungement for certain eligible offenses. Contra Costa County — particularly Richmond — generates court filings that are subject to expungement petitions over time. A clean cc-courts.org result is less definitive as a confirmation of no criminal history than a clean result in states with more limited sealing. Cross-referencing with aggregator data is standard for Richmond searches where expungement may have affected portal completeness.
Can I use these searches for jobs, housing, or insurance decisions?
No. The services discussed on this page are not consumer reporting agencies and the information here is not a consumer report. They should not be used for employment, tenant screening, insurance underwriting, credit, or any other purpose regulated by the Fair Credit Reporting Act.
Other California county guides
