Contra Costa County Treasurer -Tax Collector

Dan M. Mierzwa

Treasurer-Tax Collector

Belinda Zhu
Assistant Treasurer

Lulis Lopez
Assistant Tax Collector

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Finance Building

625 Court St., Ste 100
Martinez CA 94553
Driving Directions

Mailing Address

P.O. Box 631
Martinez, CA 94553

Walk-in Hours

Monday through Friday
8 a.m. to 5 p.m.

Call Center Hours

Monday through Friday
9 a.m. to 4 p.m.

Call Center Phone

(925) 608-9500

ADA Coordinator

          (925) 608-9588 

          TTY: Call 711


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  1. Treasury Oversight Committee Quarterly Meeting

    Meetings are held semi-annually on the third Tuesday of March and September starting at 3:00 PM in the Multi-Purpose Room B010 of the County Finance Building, located at 625 Court St., Martinez, CA 94553. Read more...

    On October 24, 2023, Dan Mierzwa, Contra Costa County Tax Collector, was directed to conduct a public auction sale by the Board of Supervisors of Contra Costa County, California. The tax-defaulted properties listed below are subject to the tax coll... Read more...
  3. Monthly Payment of Annual Property Tax Made Simple

    Are you having trouble paying your annual property taxes in two installments? Would it help you to pay them in monthly payments? Read more...
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