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  1. Welcome to the Tax Portal


    We've collated all the information you need regarding Contra Costa taxes. Peruse rates information, view relief programs, make a payment, or contact one of our offices.
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  1. Tax Calendar

October 2019

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27 28 29 30 31 1 2

  1. Mon, Nov 11

    Closed for Veterans Day
    Read More

  2. Tue, Nov 19

    Treasury Oversight Committee The Board of Supervisors established the Treasury ...
    Read More

  3. Thu, Nov 28 - Fri, Nov 29

    Closed for Thanksgiving Day and Friday
    Read More
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  1. Tax News
  1. FAQ3

    Frequently Asked Questions

    Have a question about property taxes in Contra Costa County? You are not alone. Hopefully, we have the answer you are looking for. Read more...
  2. Senior Group

    Tax Assistance for Seniors

    Depending on age and sometimes income, Seniors may qualify for certain tax assistance. Read more...
  3. Important Dates5

    Important Tax Dates

    The following schedule is intended to serve as a general guide to property owners in Contra Costa County, California. Read more...
  4. Tax time on a calculator

    Billing & Payments

    Explore options for receiving the annual tax bill and for paying your taxes, plus more. Read on...
  5. Person putting keys into the hands of another

    New Property Owners

    As a new owner you may not receive a bill since it is mailed out only once a year. If you recently bought property, you should contact our office to find out the tax status and obtain a copy of the bill. Read on...
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  1. Contact Us:   Public Information Contacts  Contact Webmaster

    Government Center:       651 Pine Street, Martinez, CA 94553
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