2026 Property Tax Due Dates
December 10
First installment
April 10
Second installment
Payment Methods
Online, Mail, In-Person
Contra Costa County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Contra Costa County Treasurer
In Person
Visit the Treasurer's office — 625 Court St, Room 100, Martinez CA 94553, Mon-Fri 8am - 5pm
Other Counties in California
About Contra Costa County
Contra Costa County ( ; Contra Costa, Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States census, the population was 1,165,927. The county seat is Martinez.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you 14 days before your property taxes are due.
Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.