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UNITEDSTATES
SECURITIESANDEXCHANGECOMMISSION
Washington,D.C.20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-08573

Name of Fund: BlackRock MuniHoldings California Insured Fund, Inc. (MUC)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
MuniHoldings California Insured Fund, Inc., 55 East 52nd Street, New York, NY 10055.

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 07/31/2010

Date of reporting period: 04/30/2010

Item 1 – Schedule of Investments

Schedule of Investments April 30, 2010 (Unaudited)

BlackRock MuniHoldings California Insured Fund, Inc. (MUC)

(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
California — 122.6%       
Corporate — 3.5%       
City of Chula Vista California, Refunding     
   RB, San Diego Gas & Electric,       
   Series A, 5.88%, 2/15/34  $ 2,435  $ 2,684,247 
University of California, RB, Limited       
   Project, Series B (AGM), 5.00%,       
   5/15/33    17,400  17,660,130 
      20,344,377 
County/City/Special District/School District — 52.4%   
Alameda County Joint Powers Authority,     
   Refunding RB, Lease (AGM), 5.00%,     
   12/01/34    13,150  13,483,089 
Bonita Unified School District, California,     
   GO, Election of 2004, Series B:       
(BHAC), 5.00%, 8/01/31    5,000  5,134,650 
(NPFGC), 5.00%, 8/01/29    8,350  8,583,967 
Central Unified School District, GO,       
   Election of 2008, Series A (AGC),       
   5.63%, 8/01/33    2,600  2,786,628 
City of Garden Grove California, COP,       
   Series A, Financing Project (AMBAC),     
   5.50%, 3/01/26    4,040  4,237,879 
City of Lodi California, COP, Refunding,     
   Series A (AGM), 5.00%, 10/01/32    2,030  2,039,906 
City of Redding California, COP,       
   Refunding, Series A (AGM), 5.00%,       
   6/01/30    5,000  5,099,750 
Colton Joint Unified School District, GO,     
   Series A (NPFGC), 5.38%, 8/01/26    2,500  2,659,175 
Corona Department of Water & Power,     
   COP (NPFGC), 5.00%, 9/01/29    5,910  5,978,556 
Corona-Norca Unified School District       
   California, GO, Election of 2006,       
   Series A (AGM), 5.00%, 8/01/31    5,000  5,087,850 
County of Kern California, COP, Capital     
   Improvements Projects, Series A       
   (AGC), 6.00%, 8/01/35    3,500  3,881,430 
County of San Joaquin California, COP,     
   Refunding, County Administration       
   Building (NPFGC), 5.00%, 11/15/30  3,730  3,590,871 
Covina-Valley Unified School District,       
   California, GO, Refunding, Series A       
   (AGM), 5.50%, 8/01/26    2,395  2,538,125 

     Par   
Municipal Bonds    (000)  Value 
California (continued)       
County/City/Special District/School District (continued)   
Culver City Redevelopment Finance       
   Authority, California, Tax Allocation       
   Bonds, Refunding, Series A (AGM),       
   5.60%, 11/01/25  $ 3,750   $ 3,833,212 
Desert Community College District,       
   California, GO, Series C (AGM), 5.00%,     
   8/01/37    16,530  16,769,685 
East Side Union High School District-       
   Santa Clara County California, GO,       
   CAB, Election of 2002, Series E       
   (Syncora), 5.12%, 8/01/28 (a)    11,000  3,533,090 
Fullerton Joint Union High School       
   District, California, GO, Election of       
   2002, Series B (NPFGC), 5.00%,       
   8/01/29    5,200  5,322,512 
Hemet Unified School District,       
   California, GO, Election of 2006,       
   Series B (AGC), 5.13%, 8/01/37    4,500  4,586,085 
Los Angeles Community Redevelopment     
   Agency, California, RB, Bunker Hill       
   Project, Series A (AGM), 5.00%,       
   12/01/27    10,000  10,113,800 
Los Angeles County Metropolitan       
   Transportation Authority, Refunding       
   RB, Proposition A, First Tier, Senior       
   Series A (AMBAC), 5.00%, 7/01/35    9,000  9,309,780 
Los Angeles Unified School District       
   California, GO, Election of 2004,       
   Series H (AGM), 5.00%, 7/01/32    2,250  2,294,663 
Los Gatos Union School District,       
   California, GO, Election of 2001,       
   Series B (AGM), 5.00%, 8/01/30    2,735  2,778,240 
Marysville Joint Unified School District,     
   California, GO, Election of 2008 (AGC),     
   5.13%, 8/01/34    6,915  7,060,077 
Merced Community College District,       
   California, GO, School Facilities       
   Improvement District No. 1 (NPFGC),     
   5.00%, 8/01/31    6,340  6,359,781 
Ohlone Community College District, GO,     
   Ohlone, Series B (AGM), 5.00%,       
   8/01/30    5,000  5,122,500 
Port of Oakland, Refunding RB, Series     
   M, AMT (NPFGC), 5.38%, 11/01/27  22,465  22,003,794 

Portfolio Abbreviations

To simplify the listings of portfolio holdings in the Schedule of Investments, the names and descriptions of many of the securities have been abbreviated
according to the following list:

AGC  Assured Guaranty Corp.  COP  Certificates of Participation 
AGM  Assured Guaranty Municipal Corp.  GO  General Obligation Bonds 
AMBAC  American Municipal Bond Assurance Corp.  HFA  Housing Finance Agency 
AMT  Alternative Minimum Tax (subject to)  NPFGC  National Public Finance Guarantee Corp. 
BHAC  Berkshire Hathaway Assurance Corp.  RB  Revenue Bonds 
CAB  Capital Appreciation Bonds  S/F  Single-Family 

BLACKROCK MUNIHOLDINGS CALIFORNIA INSURED FUND, INC.

APRIL 30, 2010

1

Schedule of Investments (continued)

BlackRock MuniHoldings California Insured Fund, Inc. (MUC)
(Percentages shown are based on Net Assets)

   Par   
Municipal Bonds  (000)  Value 
California (continued)     
County/City/Special District/School District (continued)   
Poway Unified School District, Special     
   Tax Bonds (AMBAC), 5.00%, 9/15/31 $  8,590   $ 8,401,879 
Redlands Unified School District,     
   California, GO, Election of 2008     
   (AGM), 5.25%, 7/01/33  5,000  5,146,850 
Redwoods Community College District,     
   GO, Election of 2004 (NPFGC), 5.00%,     
   8/01/31  4,630  4,702,274 
Riverside Unified School District,     
   California, GO, Election of 2001,     
   Series B (NPFGC), 5.00%, 8/01/30  10,735  10,802,845 
Saddleback Valley Unified School     
   District, California, GO (AGM), 5.00%,     
   8/01/29  4,115  4,209,522 
Salinas Union High School District,     
   California, GO, Election of 2002,     
   Series B (NPFGC), 5.00%, 6/01/26  3,490  3,565,105 
San Bernardino Community College     
   District, California, GO, Election of     
   2002, Series C (AGM), 5.00%,     
   8/01/31  17,770  18,189,905 
San Francisco Bay Area Transit     
   Financing Authority, Refunding RB,     
   Series A (NPFGC), 5.00%, 7/01/34  2,500  2,544,225 
San Francisco Community College     
   District, California, GO, Election of     
   2001, Series C (AGM), 5.00%,     
   6/15/31  4,195  4,321,815 
San Jose Evergreen Community College     
   District, California, GO, Refunding,     
   CAB, Election of 2004, Series A     
   (NPFGC), 5.17%, 9/01/24 (a)  10,410  4,954,223 
San Jose Financing Authority, Refunding     
   RB, Civic Center Project, Series B     
   (AMBAC), 5.00%, 6/01/32  14,800  14,851,652 
San Juan Unified School District,     
   California, GO, Election of 2002     
   (NPFGC), 5.00%, 8/01/28  4,250  4,324,927 
San Mateo County Transportation     
   District, California, Refunding RB,     
   Series A (NPFGC), 5.00%, 6/01/29  5,650  5,888,995 
Sanger Unified School District,     
   California, GO, Election of 2006,     
   Series A (AGM), 5.00%, 8/01/27  7,345  7,620,952 
Santa Clara Redevelopment Agency,     
   California, Tax Allocation Bonds,     
   Bayshore North Project, Series A     
   (AMBAC), 5.50%, 6/01/23  10,000  10,049,900 
Santa Monica-Malibu Unified School     
   District, California, GO, Election of     
   2006, Series A (NPFGC), 5.00%,     
   8/01/32  5,000  5,090,950 

     Par   
Municipal Bonds    (000)  Value 
California (continued)       
County/City/Special District/School District (concluded)   
Santa Rosa High School District       
   California, GO, Election of 2002       
   (NPFGC), 5.00%, 8/01/28  $ 2,855   $ 2,876,070 
Sierra Joint Community College District,     
   California, GO, Improvement District     
   No. 2-Western Nevada County       
   Campus, Series A (NPFGC), 5.00%,       
   8/01/28     1,550  1,584,999 
Snowline Joint Unified School District,     
   COP, Refunding, Refining Project       
   (AGC), 5.75%, 9/01/38     5,635  6,230,112 
Vista Unified School District, California,     
   GO, Series B (NPFGC), 5.00%,       
   8/01/28     2,550  2,594,957 
Walnut Valley Unified School District,       
   California, GO, Election of 2007,       
   Measure S, Series A (AGM), 5.00%,     
   2/01/33     2,000  2,046,000 
West Contra Costa Unified School       
   District, California, GO (AGM):       
Election of 2002, Series B, 5.00%,     
       8/01/32     6,690  6,704,986 
Election of 2005, Series A, 5.00%,     
       8/01/26     2,595  2,656,138 
Westminster Redevelopment Agency,     
   California, Tax Allocation Bonds,       
   Subordinate, Commercial       
   Redevelopment Project No. 1 (AGC),     
   6.25%, 11/01/39     4,300  4,900,581 
      308,448,957 
Education — 9.0%       
California State Public Works Board, RB,     
   University of California, Institute       
   Project, Series C (AMBAC), 5.00%,       
   4/01/30     5,000  5,012,750 
California State University, RB,       
   Systemwide, Series A (AGM), 5.00%,     
   11/01/39     8,450  8,544,386 
California State University, Refunding     
   RB, Systemwide, Series A (AGM),       
   5.00%, 11/01/29     5,000  5,118,200 
Riverside Community College District,     
   GO, Election of 2004, Series C (AGM),     
   5.00%, 8/01/32     8,750  8,957,725 
University of California, RB, Limited       
   Project, Series D (AGM):       
       5.00%, 5/15/37     5,950  6,055,851 
       5.00%, 5/15/41     8,000  8,104,000 
University of California, Refunding RB,     
   General, Series A (AMBAC), 5.00%,       
   5/15/27    10,500  10,954,230 
      52,747,142 

2 BLACKROCK MUNIHOLDINGS CALIFORNIA INSURED FUND, INC.

APRIL 30, 2010

Schedule of Investments (continued)

BlackRock MuniHoldings California Insured Fund, Inc. (MUC)
(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
California (continued)       
Health — 2.5%       
ABAG Finance Authority for Nonprofit       
   Corps, Refunding RB, Sharp       
   Healthcare, 6.25%, 8/01/39  $ 5,000  $ 5,454,150 
California Health Facilities Financing       
   Authority, Refunding RB, Catholic       
   Healthcare West, Series A, 6.00%,       
   7/01/34    3,700  3,980,460 
California Statewide Communities       
   Development Authority, RB, Health       
   Facility, Memorial Health Services,       
   Series A, 6.00%, 10/01/23    4,915  5,128,065 
      14,562,675 
Housing — 0.1%       
California HFA, RB, AMT (NPFGC),       
   Class II:       
       S/F Mortgage, Series C-2, 5.63%,       
       8/01/20    155  155,029 
       Series A1, 6.00%, 8/01/20    160  160,176 
      315,205 
State — 6.7%       
California Community College Financing     
   Authority, RB, Grossmont-Palomar-       
   Shasta, Series A (NPFGC), 5.63%,       
   4/01/26    2,180  2,206,138 
California State Public Works Board, RB,     
   Department of Education, Riverside     
   Campus Project, Series B, 6.50%,       
   4/01/34    3,500  3,769,500 
California State University, Refunding       
   RB, Systemwide, Series C (NPFGC),       
   5.00%, 11/01/28    16,215  16,645,995 
State of California, GO, Various Purpose:     
       6.00%, 3/01/33    5,000  5,503,550 
       6.50%, 4/01/33    10,000  11,337,700 
      39,462,883 
Transportation — 12.0%       
City of Fresno California, RB, Series B,     
   AMT (AGM), 5.50%, 7/01/20    4,455  4,491,754 
City of San Jose California, Refunding       
   RB, Series A, AMT (AGM), 5.50%,       
   3/01/19    5,220  5,606,489 
County of Orange California, RB,       
   Series B, 5.75%, 7/01/34    6,345  6,892,764 
County of Sacramento California, RB,       
   Senior Series B, 5.75%, 7/01/39    2,650  2,849,784 
Los Angeles Department of Airports,       
   Refunding RB, Senior, Los Angeles       
   International Airport, Series A, 5.00%,     
   5/15/40    8,770  8,936,279 
Port of Oakland, RB, Series K, AMT       
   (NPFGC), 5.75%, 11/01/29    19,660  19,658,820 

     Par   
Municipal Bonds    (000)  Value 
California (continued)       
Transportation (concluded)       
San Francisco City & County Airports       
   Commission, RB:       
       Second Series, Issue 24A, AMT       
       (AGM), 5.50%, 5/01/24  $ 6,430  $ 6,495,200 
       Series E, 6.00%, 5/01/39    9,650  10,584,506 
San Francisco City & County Airports       
   Commission, Refunding RB, Second     
   Series 34E, AMT (AGM), 5.75%,       
   5/01/24    5,000  5,316,000 
      70,831,596 
Utilities — 36.4%       
City of Escondido California, COP,       
   Refunding, Series A (NPFGC), 5.75%,     
   9/01/24    465  476,230 
City of Glendale California, RB (AGC),       
   5.00%, 2/01/31    5,030  5,189,401 
City of Napa California, RB (AMBAC),       
   5.00%, 5/01/35    9,100  9,310,301 
City of Santa Clara California, RB, Sub-     
   Series A (NPFGC), 5.00%, 7/01/28    6,050  6,095,375 
East Bay Municipal Utility District, RB,       
   Sub-Series A (NPFGC), 5.00%,       
   6/01/35    11,920  12,330,167 
East Bay Municipal Utility District,       
   Refunding RB, Sub-Series A (AMBAC):     
       5.00%, 6/01/33    6,545  6,875,064 
       5.00%, 6/01/37    14,515  15,147,419 
Los Angeles Department of Water &       
   Power, RB, System:       
       Sub-Series A-1 (AMBAC), 5.00%,       
       7/01/36    4,610  4,722,714 
       Sub-Series A-2 (AGM), 5.00%,       
       7/01/35    7,500  7,695,525 
       Sub-Series A-2 (AMBAC), 5.00%,       
       7/01/35    1,150  1,179,981 
Metropolitan Water District of Southern     
   California, RB:       
       Series A (AGM), 5.00%, 7/01/35    12,870  13,288,918 
       Series B-1 (NPFGC), 5.00%,       
       10/01/33    9,000  9,186,570 
Oxnard Financing Authority, RB (NPFGC):     
       Project, 5.00%, 6/01/31    10,000  9,999,600 
       Redwood Trunk Sewer &       
       Headworks, Series A, 5.25%,       
       6/01/34    13,000  13,094,250 
Sacramento City Financing Authority       
   California, Refunding RB (NPFGC),       
   5.00%, 12/01/29    8,775  8,613,452 
Sacramento Municipal Utility District,       
   RB, Cosumnes Project (NPFGC),       
   5.13%, 7/01/29    36,760  36,998,940 

BLACKROCK MUNIHOLDINGS CALIFORNIA INSURED FUND, INC.

APRIL 30, 2010

3

Schedule of Investments (continued)

BlackRock MuniHoldings California Insured Fund, Inc. (MUC)

(Percentages shown are based on Net Assets)

     Par   
Municipal Bonds    (000)  Value 
California (concluded)       
Utilities (concluded)       
Sacramento Regional County Sanitation     
   District, RB (NPFGC), 5.00%,       
   12/01/36  $ 4,500   $ 4,587,255 
San Diego County Water Authority, COP,     
   Refunding, Series A (NPFGC), 5.00%,     
   5/01/32    10,000  10,130,600 
San Francisco City & County Public       
   Utilities Commission, RB:       
Series A (NPFGC), 5.00%,       
11/01/32                     15,000  15,193,350 
Series B, 5.00%, 11/01/30    16,705  17,529,559 
Turlock Public Financing Authority       
   California, RB, Series A (NPFGC),       
   5.00%, 9/15/33    6,655  6,741,116 
      214,385,787 
 Total Municipal Bonds  - 122.6 %                                      721,098,622  
Municipal Bonds Transferred to Tender     
Option Bond Trusts (b)       
California — 29.6%       
Corporate — 4.0%       
San Francisco Bay Area Rapid Transit       
   District, Refunding RB, Series A       
   (NPFGC), 5.00%, 7/01/30    23,100  23,744,028 
County/City/Special District/School District — 11.6%   
Contra Costa Community College District     
   California, GO, Election of 2002       
   (NPFGC), 5.00%, 8/01/28    7,800  8,000,460 
Los Angeles Community College District     
   California, GO, Election of 2008,       
   Series A, 6.00%, 8/01/33    9,596  10,759,838 
Peralta Community College District, GO,     
   Election of 2000, Series D (AGM),       
   5.00%, 8/01/35    15,490  15,710,113 
Poway Unified School District, GO,       
   Election of 2002, Improvement       
   District 02, Series 1-B (AGM), 5.00%,     
   8/01/30    10,000  10,247,300 
San Diego Community College District     
   California, GO, Election of 2002       
   (AGM), 5.00%, 5/01/30    12,549  12,917,492 
Vista Unified School District California,     
   GO, Series A (AGM), 5.25%, 8/01/25  10,016  10,467,877 
      68,103,080 
Education — 8.6%       
Chaffey Community College District, GO,     
   Election of 2002, Series B (NPFGC),     
   5.00%, 6/01/30    9,905  10,109,645 

Municipal Bonds Transferred to Tender  Par   
Option Bond Trusts (b)  (000)             Value 
California (concluded)     
Education (concluded)     
Los Angeles Community College District     
   California, GO, Election of 2003,     
   Series E (AGM), 5.00%, 8/01/31  $ 11,216  $ 11,481,220 
Peralta Community College District, GO,     
   Peralta Community College (AGM),     
   5.00%, 8/01/32  6,980  7,145,705 
Riverside Community College District,     
   GO, Election of 2004, Series C     
   (NPFGC), 5.00%, 8/01/32  8,910  9,083,032 
University of California, RB, Series O,     
   5.75%, 5/15/34  11,190  12,564,020 
    50,383,622 
Utilities — 5.4%     
Los Angeles Department of Water &     
   Power, RB, Power System, Sub-Series     
   A-1 (AGM), 5.00%, 7/01/31  4,993  5,155,090 
Rancho Water District Financing     
   Authority, Refunding RB, Series A     
   (AGM), 5.00%, 8/01/34  5,008  5,123,478 
San Diego County Water Authority, COP,     
   Refunding, Series 2008-A (AGM),     
   5.00%, 5/01/33  16,740  17,263,292 
San Diego County Water Authority, COP,     
   Series A (AGM), 5.00%, 5/01/31  4,000  4,090,480 
    31,632,340 
Total Municipal Bonds Transferred to     
Tender Option Bond Trusts – 29.6%    173,863,070 
Total Long-Term Investments     
(Cost – $887,609,801) – 152.2%    894,961,692 

4 BLACKROCK MUNIHOLDINGS CALIFORNIA INSURED FUND, INC.

APRIL 30, 2010

Schedule of Investments (concluded)

BlackRock MuniHoldings California Insured Fund, Inc. (MUC)

(Percentages shown are based on Net Assets)

Short-Term Securities  Shares                 Value 
CMA California Municipal Money     
Fund, 0.04% (c)(d)  17,898,633  $ 17,898,633 
Total Short-Term Securities     
(Cost – $17,898,633) – 3.0%    17,898,633 
Total Investments     
(Cost – $905,508,434*) – 155.2%    912,860,325 
Other Assets Less Liabilities –4.4%    26,011,685 
Liability for Trust Certificates, Including Interest   
Expense and Fees Payable – (16.4)%    (96,588,545) 
Preferred Shares, at Redemption Value – (43.2)%  (254,021,615) 
Net Assets Applicable to Common Shares – 100.0%  $ 588,261,850 

* The cost and unrealized appreciation (depreciation) of investments as of

April 30, 2010, as computed for federal income tax purposes, were as

Aggregate follows: cost  $ 809,017,292 
Gross unrealized appreciation  $ 14,762,870 
Gross unrealized depreciation  (7,422,740) 
Net unrealized appreciation  $ 7,340,130 

(a) Represents a zero-coupon bond. Rate shown reflects the current yield as
of report date.
(b) Securities represent bonds transferred to a tender option bond trust in
exchange for which the Fund acquired residual interest certificates. These
securities serve as collateral in a financial transaction.
(c) Investments in companies considered to be an affiliate of the Fund during
the period, for purposes of Section 2(a)(3) of the Investment Company Act
of 1940, were as follows:
______________________________________________________________________________________________________________________________________________________________________________________________________________

Shares Held    Shares Held 
at July 31,  Net  at April 30, 
Affiliate                  2009                                                                               Activity 2010      Income  
CMA California     
Municipal     
Money Fund         20,500,814                            (2,602,181)                            17,898,633      $3,984 
(d) Represents the current yield as of report date.   

• Fair Value Measurements - Various inputs are used in determining the fair
value of investments, which are as follows:

• Level 1 — price quotations in active markets/exchanges for identical
assets and liabilities

• Level 2 — other observable inputs (including, but not limited to: quoted
prices for similar assets or liabilities in markets that are active, quoted
prices for identical or similar assets or liabilities in markets that are not
active, inputs other than quoted prices that are observable for the assets
or liabilities (such as interest rates, yield curves, volatilities, prepayment
speeds, loss severities, credit risks and default rates) or other market-
corroborated inputs)

• Level 3 — unobservable inputs based on the best information available in
the circumstances, to the extent observable inputs are not available
(including the Fund's own assumptions used in determining the fair value
of investments)

The inputs or methodologies used for valuing securities are not necessarily
an indication of the risk associated with investing in those securities. For
information about the Fund's policy regarding valuation of investments and
other significant accounting policies, please refer to the Fund’s most recent
financial statements as contained in its semi-annual report.

The following table summarizes the inputs used as of April 30, 2010 in
determining the fair valuation of the Fund's investments:

Investments in Securities
Valuation Inputs         Level 1  Level 2  Level 3  Total 
Assets:         
Long-Term         
   Investments1  —    $ 894,961,692           — $ 894,961,692 
Short-Term         
   Securities  $ 17,898,633  —           — 17,898,633 
Total  $ 17,898,633 $ 894,961,692           — $ 912,860,325 

1 See above Schedule of Investments for values in the state.

BLACKROCK MUNIHOLDINGS CALIFORNIA INSURED FUND, INC.

APRIL 30, 2010

5

Item 2 – Controls and Procedures

2(a) – The registrant's principal executive and principal financial officers or persons performing
similar functions have concluded that the registrant's disclosure controls and procedures (as
defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the
“1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the
evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act
and Rule 13(a)-15(b) under the Securities Exchange Act of 1934, as amended.

2(b) – There were no changes in the registrant's internal control over financial reporting (as defined
in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant's last fiscal quarter
that have materially affected, or are reasonably likely to materially affect, the registrant's
internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and 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 MuniHoldings California Insured Fund, Inc.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock MuniHoldings California Insured Fund, Inc.

Date: June 28, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment
Company Act of 1940, this report has been signed below by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer (principal executive officer) of
BlackRock MuniHoldings California Insured Fund, Inc.

Date: June 28, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock MuniHoldings California Insured Fund, Inc.

Date: June 28, 2010