December 13,1999
Securities and Exchange Commission
450 Fifth Street, N.W.
Judiciary Plaza
Washington, D.C. 20549
Attention: Division of Investment Management
Re: Merrill Lynch California Insured Municipal
Bond Fund of Merrill Lynch California
Municipal Series Trust
Post-Effective Amendment No.9 to the
Registration Statement on Form N-1A
(Securities Act File No. 33-55864
Investment Company Act File No. 811-04264-01)
Ladies and Gentlemen:
Pursuant to Rule 497 (j) under the Securities Act of
1933, as amended (the "1933 Act"), Merrill Lynch California
Insured Municipal Bond Fund of Merrill Lynch California
Municipal Series Trust (the "Trust")hereby certifies that:
(1) the form of prospectus and statement of additional
information that would have been filed pursuant to
Rule 497 (c) under the 1933 Act would not have
differed from that contained in Post-Effective
Amendment No. 9 to the Trust's Registration Statement
on Form N-1A, constituting the most recent amendment
to the Trust's Registration Statement on Form N-1A;
and
(2) the text of Post-Effective Amendment No. 9 to the
Trust's Registration Statement on Form N-1A was filed
electronically with the Securities and Exchange
Commission on December 8, 1999.
Very truly yours,
Merrill Lynch California Insured Municipal Bond Fund
of Merrill Lynch California Municipal Series Trust
By: /s/ Alice Pellegrino
_________________________
Alice Pellegrino
Secretary
