Contra Costa County is on the eastern 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 diverse economic and demographic profiles in the Bay Area — Richmond and San Pablo on the western shoreline are lower-income and 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; and Brentwood, Oakley, and Antioch in eastern Contra Costa are among the Bay Area's fastest-growing suburban communities driven by housing-cost out-migration from the inner Bay Area.
California has no unified statewide court portal — each Superior Court maintains its own system. Contra Costa County Superior Court is accessible through the county's own portal. For the broader California context, see our California state guide.
Key takeaways
- Contra Costa County (pop. est. 1,150,000 — U.S. Census Bureau, 2023 ACS) has no statewide California portal — Contra Costa County Superior Court has its own separate online case access system.
- The county has multiple courthouse locations — Martinez (county seat, main courthouse), Richmond, Walnut Creek, and Pittsburg handle different geographic areas and case types.
- Eastern Contra Costa (Antioch, Brentwood, Oakley) has seen rapid growth from Bay Area out-migration — many residents have prior Alameda County or San Francisco County address histories.
- Richmond and San Pablo have large Latino and African American communities — Spanish-language and multi-variant name checking is relevant for searches in the western county.
Contra Costa County quick facts
- Population estimate (2023): approximately 1,150,000 (U.S. Census Bureau, 2023 ACS)
- County seat: Martinez
- Largest city: Concord
- State: California
- Primary court: Contra Costa County Superior Court (multiple courthouse locations)
Population estimates from the U.S. Census Bureau.
How record searches work in Contra Costa County
Contra Costa County Superior Court maintains its own online case access portal at cc-courts.org. The portal covers felony criminal, civil, family, and probate matters. Case filing location matters — cases filed in Martinez, Richmond, Walnut Creek, and Pittsburg courthouses are all in the same system but may require knowing which division handled the matter for document retrieval.
California DOJ maintains a statewide criminal history system but public access requires a fee-based name check through an authorized process. For Bay Area cross-county supplements, Alameda County Superior Court (Oakland) is the most common prior-county source for Contra Costa residents. Our guide on finding someone by name and city covers how to use Concord or Richmond as an East Bay anchor.
Types of records available in Contra Costa County
- Superior Court records — cc-courts.org for criminal, civil, family, and probate
- Property records — Contra Costa County Assessor's Office online portal
- Vital records — Contra Costa County Clerk-Recorder for marriage; California CDPH statewide index
- Arrest records — Contra Costa County Sheriff, Richmond PD, Concord PD, other city agencies
- Bay Area supplement — Alameda County Superior Court for prior Oakland/East Bay records
Crime statistics and public-safety context
Contra Costa County has bifurcated crime rates. Richmond consistently has among the highest violent crime rates of any Bay Area city; western county communities (San Pablo, El Cerrito) also have elevated rates. Central and eastern county communities have much lower rates. Source: California Department of Justice, Crime in California 2022.
Major cities in Contra Costa County
Concord
Concord (est. 130,000 — U.S. Census Bureau, 2023 ACS) is Contra Costa County's largest city and a central East Bay hub. Concord has a diverse demographic profile and a mix of longtime working-class residents and Bay Area in-migrants. The Walnut Creek courthouse — covering central Contra Costa including Concord — handles civil and family matters; criminal matters may route through Martinez or Walnut Creek depending on the case type.
Richmond and San Pablo
Richmond (est. 115,000 — U.S. Census Bureau, 2023 ACS) and adjacent San Pablo are on the Bay shoreline in western Contra Costa. Richmond has a significant Latino and African American community and 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.
Antioch and eastern Contra Costa
Antioch (est. 118,000 — U.S. Census Bureau, 2023 ACS) and the eastern county communities of Brentwood, Oakley, and Pittsburg have grown substantially as Bay Area housing costs pushed residents eastward. Many current residents have prior Alameda County or even San Francisco County address histories from before the move. The Pittsburg courthouse handles eastern county criminal matters. Eastern Contra Costa has higher property crime rates than the central county.
Walnut Creek and Lamorinda
Walnut Creek (est. 70,000 — U.S. Census Bureau, 2023 ACS) is the commercial and professional services hub of central Contra Costa. Lafayette, Moraga, and Orinda (the Lamorinda communities) are among the Bay Area's most affluent suburban communities. Court filing rates in these communities are very low. The Walnut Creek courthouse handles civil and family court matters for the central county.
Common search scenarios
Searching by city in Contra Costa County
All Contra Costa cities route to the same county Superior Court system at cc-courts.org. The courthouse that handled a specific matter (Martinez, Richmond, Walnut Creek, Pittsburg) affects document retrieval but not the online case search. For prior Bay Area addresses, Alameda County Superior Court is the most common supplement.
Checking court records
cc-courts.org Superior Court search → Alameda County Superior Court for prior Oakland/East Bay records → California DOJ for statewide criminal history context. See our court record search guide for national context on California's county-by-county portal structure.
Eastern county in-migration searches
For Antioch, Brentwood, and Oakley subjects who relocated from the inner Bay Area within the last 5–10 years, prior Alameda County records are often more substantive than current Contra Costa records. Alameda County Superior Court at alameda.courts.ca.gov is the standard supplement.
Start Here: Enter Any Name To View Records
Best sites to review first
Before navigating Contra Costa County Superior Court, these are the two services I recommend reviewing first.
| Service | Why people use it | Best fit |
|---|---|---|
| Instant Checkmate | Useful for establishing which part of Contra Costa County the subject is in and for identifying prior Alameda or San Francisco county addresses before routing Superior Court searches. | Quick first-pass searches |
| TruthFinder | Useful for broader Bay Area address history spanning Contra Costa, Alameda, and San Francisco counties — standard for subjects who have followed the Bay Area out-migration pattern eastward. | Expanded public-record context |
Frequently asked questions
Does Contra Costa County have an online court records search?
Yes. Contra Costa County Superior Court maintains its own online case access portal at cc-courts.org covering criminal, civil, family, and probate matters. California has no unified statewide court portal — each county maintains its own system. For Bay Area cross-county searching, Alameda County Superior Court at alameda.courts.ca.gov is the standard supplement for subjects with prior Oakland or inner East Bay address histories.
Can you look up marriage or divorce records in Contra Costa County?
Yes. Marriage licenses in Contra Costa County are issued and recorded by the Contra Costa County Clerk-Recorder. The California Department of Public Health maintains a statewide marriage index from 1905 forward and a divorce index — certified copies available by mail or through VitalChek. Divorce case indexes are accessible through cc-courts.org. Contra Costa County generates significant marriage and divorce filing volume as one of the Bay Area's most populous counties.
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
- Los Angeles County
- San Diego County
- Alameda County (Oakland)
- Santa Clara County (San Jose)
- Sacramento County
- Orange County
Browse all county guides: People Search by County
