Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. Every office link was opened and checked against the office's own site on September 23, 2026.
Contra Costa County, California, has about 1.2 million residents (2024 Census Bureau estimate). The title to a parcel in Contra Costa County is in the deed records of the County Recorder and its taxable value is set by the County Assessor; what is built on it is a matter for the city or the county. This guide says who keeps each record and where the page for each office is.
This guide covers deeds, assessed values, city permits, evictions and court cases, records requests 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.
Deeds, Mortgages and Liens in Contra Costa County
Who owns a parcel in Contra Costa County and what it sold for are in the deed records of the County Recorder, with every lien or mortgage against the land.
SearchSystems opened and checked the County Recorder's page at contracostavote.gov/recorder/county-recorder-division (page title: COUNTY RECORDER DIVISION | Contra Costa County), phone 925-335-7900, 555 Escobar St., Martinez, CA 94553, which answered when SearchSystems opened it on September 23, 2026.
Assessed Values and the Tax Roll in Contra Costa County
What a parcel in Contra Costa County is taxed on is the business of the County Assessor, which also keeps the parcel maps. Under Proposition 13 a property's assessed value is set when it changes hands and can rise no more than 2 percent a year after that, so a home owned for decades is often assessed far below its market value.
SearchSystems opened and checked the County Assessor's page at contracosta.ca.gov/552/Maps-Property-Information (page title: Maps & Property Information | Contra Costa County, CA Official Website), which answered when SearchSystems opened it on September 23, 2026.
Permits and City Records in the Cities of Contra Costa County
Building permits, zoning and code cases inside a city are the city's own records. The cities in Contra Costa County with a SearchSystems guide to their offices, the largest twelve first, with the city page SearchSystems verified:
- Concord: the city hall page SearchSystems verified is at cityofconcord.org/535/City-Contacts (verified September 25, 2026).
- Antioch: the city hall page SearchSystems verified is at antiochca.gov/m/directory/department?did=53 (verified September 25, 2026).
- Richmond: the city hall page SearchSystems verified is at ci.richmond.ca.us/facilities/facility/details/City-Hall-1 (verified September 25, 2026).
- San Ramon: the city clerk's page SearchSystems verified is at sanramon.ca.gov/our_city/departments_and_divisions/city_clerk/reque..., phone (925) 275-0650 (verified September 25, 2026).
- Pittsburg: the city hall page SearchSystems verified is at pittsburgca.gov/how-do-i/contact-the-city/department-directory, phone 925-252-6900 (verified September 25, 2026).
- Walnut Creek: the city clerk's page SearchSystems verified is at walnutcreekca.gov/government/departments/city-clerk/public-records, phone 925-335-7900 (verified September 25, 2026).
- Brentwood: the city clerk's page SearchSystems verified is at brentwoodca.gov/government/city-manager/city-clerk, phone 925-516-5440 (verified September 25, 2026).
- Oakley: the city hall page SearchSystems verified is at oakleyca.gov (verified September 25, 2026).
- Danville: the city hall page SearchSystems verified is at danville.ca.gov/142/Contact (verified September 25, 2026).
- Martinez: the city hall page SearchSystems verified is at cityofmartinez.org/government/city-clerk, phone (925) 372-3512 (verified September 25, 2026).
- San Pablo: the city hall page SearchSystems verified is at sanpabloca.gov/1180/Contact-Us, phone (510) 724-1111 (verified September 25, 2026).
- Hercules: the city hall page SearchSystems verified is at herculesca.gov/government, phone 510-799-8200 (verified September 25, 2026).
The rest: El Cerrito, Orinda, Pinole and Moraga.
Evictions and Court Cases About Land in Contra Costa County
Court cases about land from Contra Costa County, evictions among them, are filed in the Superior Court of California, County of Contra Costa.
The court records page SearchSystems verified for the county is at contracosta.courts.ca.gov/online-services/records.
Asking a County Office for a Record
Under the California Public Records Act a county office must answer a request within 10 days, with up to 14 more days in unusual circumstances, and it may charge the direct cost of copying only, not staff time. The county records request page SearchSystems verified is at contracosta.ca.gov/8129/Public-Records-Requests (page title: Public Records Requests | Contra Costa County, CA Official Website).
Frequently Asked Questions
Who records deeds in Contra Costa County?
The County Recorder, at contracostavote.gov, phone 925-335-7900. Deeds, mortgages and liens on land in Contra Costa County are filed there, and the County Assessor (contracosta.ca.gov) has the assessment records.
Who sets the assessed value of a property in Contra Costa County?
The County Assessor, whose page SearchSystems verified is at contracosta.ca.gov.
Where are evictions from Contra Costa County filed?
In the Superior Court of California, County of Contra Costa. The file is public unless the court seals it.
How is property assessed in California?
Under Proposition 13 a property's assessed value is set when it changes hands and can rise no more than 2 percent a year after that, so a home owned for decades is often assessed far below its market value.
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.