Contra Costa County Assessor's Office in Contra Costa County, California

When visiting the county assessor's office, bring your property's parcel number or street address to quickly locate your assessment record, and bring supporting documentation if you are disputing a valuation. Contra Costa County Assessor's Office is located at 2530 Arnold Drive, Martinez, CA. Many assessor offices also maintain online portals where you can review your assessed value and exemption status before visiting in person.

About Contra Costa County Assessor's Office

The Contra Costa County Assessor's Office, located in Martinez, California, determines the value of all taxable property in Contra Costa County, CA. Taxable property includes land and commercial properties, often referred to as real property or real estate, and fixed assets owned by businesses, often referred to as personal property. Property assessments performed by the Assessor are used to determine the Contra Costa County property taxes owed by individual taxpayers.

• Property assessment values and annual reassessment notices for parcels in Contra Costa County Assessor's Office's jurisdiction
• Homestead, senior citizen, veteran, and disability exemption applications
• Formal assessment appeals and informal review requests
• GIS parcel maps, property boundary data, and ownership record corrections