SearchSystems Editorial

Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The arrest and crime counts are the ones each agency reported to the FBI, as the FBI held them on October 8, 2026. Every office link was opened and checked against the office's own site on September 23, 2026.

About this guide

Contra Costa County, California, has about 1.2 million residents (2024 Census Bureau estimate). A police report belongs to the agency whose officer wrote it, so which office holds a report from Contra Costa County depends on where the incident happened: the Contra Costa County Sheriff's Office for the unincorporated county, the agency that reports for the city inside a city. This guide names each agency, where its records page is and what the California Public Records Act requires of it.

This guide covers which agency, the sheriff's reports, the cities' reports, how many reports, what the law requires and common questions.

Related guides: Contra Costa County public records, Contra Costa County arrest records, Contra Costa County warrants, Contra Costa County inmate search, Contra Costa County criminal records, California arrest records and California inmate search.

Which Agency Holds a Report from Contra Costa County

A crime, incident or collision report belongs to the agency whose officer wrote it, and that agency releases it, not the court, the jail or the prosecutor.

In Contra Costa County that is the Contra Costa County Sheriff's Office for the unincorporated county and for any city that contracts with it for police service, and the agency that reports for a city where the city has one of its own.

The FBI's list also places the Highway Patrol's Contra Costa Area Office in Contra Costa County; a report taken on a state highway by it comes from that agency's own records office.

The FBI's list also carries San Francisco Bay Area Rapid Transit in Contra Costa County and Union Pacific Railroad in Contra Costa County (other agency) and Contra Costa Community College (campus police), each with a records office of its own.

Reports from the Contra Costa County Sheriff's Office

The Contra Costa County Sheriff's Office is the county agency; it had 428 violent and 1,579 property crimes reported for 2025 and reported 1,973 arrests for 2025.

Its reports come from its records unit. The office's page SearchSystems verified is its custody page, at cocosheriff.org/how-do-i/inmate-information (page title: Inmate Information | Contra Costa Sheriff, CA), which answered when SearchSystems opened it on September 23, 2026.

Reports from the City Agencies in Contra Costa County

The 19 cities the FBI lists in Contra Costa County with a reporting agency of their own, the largest twelve first, with the police records page SearchSystems verified where the city has a guide:

A city on that list is reported separately whether the officers are the city's own or the sheriff's under contract; the FBI's list does not say which.

The rest: Hercules, El Cerrito, Lafayette, Orinda, Pinole, Moraga and Clayton.

How Many Reports: Contra Costa County in 2025

The 21 agencies in Contra Costa County with all twelve months of 2025 on file reported 4,141 violent and 19,844 property crimes to the FBI that year, each one a report taken by the agency that holds it.

Together, the 21 agencies in Contra Costa County with all twelve months of 2025 on file reported 17,288 arrests to the FBI that year, and each arrest is a report of its own.

What the California Public Records Act Requires

The California Public Records Act sets the rules: an answer within 10 days, with up to 14 more days in unusual circumstances, at a charge of the direct cost of copying only, not staff time, from the agency that holds the report.

Any other county record goes through the county records request page SearchSystems verified, at contracosta.ca.gov/8129/Public-Records-Requests (page title: Public Records Requests | Contra Costa County, CA Official Website).

A defendant who has been charged gets the report through the case: the District Attorney, (925) 957-8602, handles discovery for pending cases.

Frequently Asked Questions

How do I get a police report in Contra Costa County?

From the agency whose officer took it: the Contra Costa County Sheriff's Office for its own arrests, or the agency that reports for the city where it happened. Under the California Public Records Act the answer is due within 10 days, with up to 14 more days in unusual circumstances.

How long does an agency in Contra Costa County have to answer?

Under the California Public Records Act, within 10 days, with up to 14 more days in unusual circumstances. It may charge the direct cost of copying only, not staff time.

Who has a crash report from a state highway in Contra Costa County?

The state agency whose officer took it; the FBI lists the Highway Patrol's Contra Costa Area Office in Contra Costa County.

How do I get a report from the Contra Costa County Sheriff's Office?

From its records unit. Under the California Public Records Act the answer is due within 10 days, with up to 14 more days in unusual circumstances.

Is this the official Contra Costa County website?

No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.