About Contra Costa County

Contra Costa County occupies the eastern shore of San Francisco Bay and stretches inland through a diverse landscape of bay wetlands, rolling hills, and broad valleys in the heart of the Bay Area. Covering approximately 720 square miles, the county ranges from the densely urbanized waterfront cities of Richmond and San Pablo in the west to the sprawling suburban communities of Concord, Walnut Creek, and Antioch in the central and eastern regions, and finally to the quieter agricultural stretches approaching the Sacramento-San Joaquin Delta. This geographic variety gives Contra Costa a genuinely distinct character — part Bay Area urban core, part suburban sprawl, and part rural California — making it one of the most physically and culturally varied counties in the state. With a population of approximately 1,165,927 residents, Contra Costa County is one of the most populous counties in California and continues to attract new residents priced out of San Francisco and Oakland. Communities like Walnut Creek, Danville, and Lafayette tend toward affluent, established neighborhoods, while Richmond, Pittsburg, and Bay Point reflect working-class roots and a more diverse economic landscape. The county is connected to San Francisco and the broader Bay Area by the BART rapid transit system, making it a natural bedroom community for professionals who work in the region's tech and finance sectors but prefer the comparatively lower housing costs east of the hills. The county seat of Martinez sits along the Carquinez Strait in the northern part of the county and serves as the center of local government, housing courthouses, county offices, and administrative facilities. Economically, Contra Costa County supports a broad mix of industries including healthcare, retail, professional services, and a significant refinery and industrial corridor along its northern shoreline. The county is also home to major employers in technology, insurance, and logistics, reflecting a mature, diversified economy. Its proximity to major Bay Area employment hubs, combined with its own growing commercial base, means residents navigate a complex mix of urban and suburban economic realities on a daily basis.

Practice Areas in Contra Costa County

Criminal Law
Criminal Law
Charges, arrests, bail and criminal trials.
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DUI
DUI
DUI charges, licence suspension and reinstatement.
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Family Law
Family Law
Divorce, custody, property and support.
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Immigration Law
Immigration
Visas, green cards, deportation and citizenship.
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Traffic Law
Traffic Law
Traffic violations, licence matters and offences.
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Employment Law
Employment Law
Wrongful termination, discrimination, disputes.
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Courts in Contra Costa County

The primary trial court serving Contra Costa County is the Contra Costa County Superior Court, which handles the full range of civil, criminal, family law, probate, juvenile, and traffic matters for all residents of the county. The Superior Court operates multiple courthouses across the county, with the main courthouse located at 725 Court Street in Martinez, which serves as the hub for felony criminal cases, civil litigation, and family law proceedings. Additional branch courthouses serve specific regions and case types, including the Wakefield Taylor Courthouse in Martinez, the Airport Courthouse in Concord at 1020 Ward Street handling misdemeanors and traffic infractions for the central county, and the Richmond Courthouse at 100 37th Street handling matters for the western portion of the county. Probate and mental health matters are typically handled at the main Martinez facility, while small claims cases can be filed at the branch location closest to where the dispute arose. There is no separate state district or magistrate court system in California — the Superior Court is the unified trial court for all case types at the state level.

Federal vs State Jurisdiction in Contra Costa County

Residents of Contra Costa County are subject to both California state law and federal law, with jurisdiction determined by the nature of the legal matter. State law cases — including most criminal offenses, family law, traffic violations, contract disputes, personal injury claims, and probate matters — are heard in the Contra Costa County Superior Court. Federal matters, including cases involving federal crimes, bankruptcy, civil rights violations under federal statutes, immigration, and disputes between citizens of different states exceeding $75,000, are heard in the United States District Court for the Northern District of California, which covers the San Francisco Bay Area including Contra Costa County. The Northern District maintains courthouses in San Francisco, Oakland, and San Jose, with most Contra Costa County federal matters typically assigned to the Oakland division located at 1301 Clay Street. Understanding which court has jurisdiction over a particular legal issue is a critical first step in any legal matter, and an experienced attorney can help Contra Costa residents determine the right forum for their case.

Common Legal Situations in Contra Costa County

Given its size, diversity, and location within one of the nation's most dynamic metropolitan regions, Contra Costa County residents encounter a wide range of legal issues in their daily lives. Traffic violations and DUI charges are among the most frequently filed matters in the county courts, particularly along busy corridors like Interstate 680 and State Route 4. Family law matters including divorce, child custody disputes, and domestic violence restraining orders are consistently high-volume cases, reflecting the county's large residential population. Employment disputes are also common, with many residents working under California's complex wage and hour laws and sometimes experiencing wrongful termination, discrimination, or unpaid overtime issues with Bay Area employers. Landlord-tenant conflicts have grown significantly as housing costs have risen across the county, and criminal defense cases ranging from drug offenses to property crimes remain a steady presence in the county's court dockets. Residents in the industrial corridor near Richmond and Pittsburg may also encounter workers' compensation matters and environmental liability issues tied to the area's refinery and manufacturing operations.

Why Go To Court for Contra Costa County Legal Matters

Go To Court provides Contra Costa County residents with reliable, accessible legal representation across a wide range of practice areas, backed by a team of experienced attorneys who understand both California state law and the specific dynamics of the local court system. Whether you are facing a criminal charge in Martinez, navigating a family law dispute in Concord, or dealing with a civil matter in any of the county's courthouses, Go To Court connects you with legal professionals who are ready to help. Residents can reach the Go To Court team at any time through the free 24/7 legal hotline, ensuring that urgent legal questions never go unanswered regardless of the hour. With fixed-fee pricing options coming soon, Go To Court is committed to making quality legal representation transparent and affordable for all Contra Costa County residents.

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Frequently Asked Questions

What happens if I get a traffic ticket in Contra Costa County — do I have to go to court?

For most infraction-level traffic tickets in Contra Costa County, you have the option to pay the fine online or by mail without appearing in court, but doing so is treated as a guilty plea and will result in a point on your driving record. If you wish to contest the ticket, you can request a court date at the relevant courthouse — typically the Concord or Richmond branch depending on where the violation occurred. Consulting with a traffic attorney before deciding how to respond can help you understand whether fighting the ticket is worthwhile and how to avoid points that could raise your insurance premiums.

How does child custody work in Contra Costa County if I am going through a divorce?

Child custody matters in Contra Costa County are handled by the Family Law division of the Contra Costa County Superior Court, and California courts make all custody decisions based on the best interests of the child. Parents are encouraged to reach a mutual parenting agreement, and the court offers Family Court Services mediation to help resolve disputes before a judge needs to intervene. If parents cannot agree, a judge will make legal and physical custody determinations after reviewing evidence and, in some cases, input from a child custody evaluator.

Can I be arrested for a DUI in Contra Costa County even if my blood alcohol level was under 0.08%?

Yes — in California, you can be charged with a DUI even if your blood alcohol concentration (BAC) is below the legal limit of 0.08% if law enforcement believes your ability to drive was impaired by alcohol or drugs. For drivers under 21, California's zero-tolerance law means any measurable BAC can result in license suspension. If you have been charged with a DUI in Contra Costa County, it is important to speak with a criminal defense attorney promptly, as there are strict deadlines — including a 10-day window to request a DMV hearing to contest your license suspension.

What are my rights as a tenant if my landlord tries to evict me in Contra Costa County?

Tenants in Contra Costa County are protected by California state eviction law, which requires landlords to provide proper written notice before initiating an unlawful detainer (eviction) action in the Superior Court. Under California's Tenant Protection Act of 2019, many tenants who have lived in a rental for more than 12 months are entitled to just-cause eviction protections and may also be eligible for relocation assistance in certain circumstances. If you receive an eviction notice, you should contact a tenant's rights attorney or legal aid organization as quickly as possible, because the deadlines for responding to an unlawful detainer lawsuit in court are very short — typically only five business days.

How do I file a small claims case in Contra Costa County and how much can I sue for?

In California, individuals can sue for up to $12,500 in small claims court, while businesses are limited to $6,250 per claim, making it a practical option for resolving disputes over security deposits, minor property damage, or unpaid debts. To file a small claims case in Contra Costa County, you submit your claim at the Superior Court branch nearest to where the defendant lives or the dispute occurred, pay a small filing fee, and then serve the defendant with notice of the hearing. Attorneys are generally not permitted to represent parties during the small claims hearing itself, but consulting with a lawyer beforehand can help you organize your evidence and understand what to expect.

Neighbouring Counties

Contra Costa County is bordered by Solano County to the north, Sacramento County and San Joaquin County to the east, Alameda County to the south, and Marin County and San Francisco across the waters of San Francisco Bay to the west.