UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-PX

ANNUAL REPORT OF PROXY VOTING RECORD OF REGISTERED MANAGEMENT

INVESTMENT COMPANY

Investment Company Act file number: 811-04264

Name of Fund: BlackRock California Municipal Opportunities Fund of BlackRock California Municipal Series Trust

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: John Perlowski, Chief Executive Officer, BlackRock California Municipal Opportunities Fund of BlackRock California Municipal Series Trust, 55 East 52^nd Street, New York City, NY 10055.

Registrant’s telephone number, including area code: (800) 441-7762

Date of fiscal year end: 05/31

Date of reporting period: 07/01/2019 – 06/30/2020

Item 1 – Proxy Voting Record – There were no matters relating to a portfolio security considered at any shareholder meeting held during the period ended June 30, 2020 with respect to which the registrant was entitled to vote

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ICA File Number: 811-04264
Reporting Period: 07/01/2019 - 06/30/2020
BlackRock California Municipal Series Trust









============== BlackRock California Municipal Opportunities Fund ===============

There is no proxy voting activity for the fund, as the fund did not hold any
votable positions during the reporting period.
========== END NPX REPORT

Pursuant to the requirements of the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

BlackRock California Municipal Opportunities Fund of BlackRock California Municipal Series Trust