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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number: 
     811-21177               

      BlackRock California Insured Municipal Income Trust      
(Exact name of registrant as specified in charter)

100 Bellevue Parkway, Wilmington, DE
 
19809
(Address of principal executive offices)
 
(Zip code)

Robert S. Kapito, President

 

BlackRock California Insured Municipal Income Trust
40 East 52nd Street, New York, NY 10022
(Name and address of agent for service)

Registrant's telephone number, including area code: 
     888-825-2257

Date of fiscal year end:
     August 31, 2007     
Date of reporting period: 
     May 31, 2007     


Item 1. Schedule of Investments.

The Registrant’s unaudited schedule of investments as of the close of the reporting period pursuant to Rule 30b1-5 under the Investment Company Act of 1940 is as follows:

 

PORTFOLIO OF INVESTMENTS (unaudited)
MAY 31, 2007

BlackRock California Insured Municipal Income Trust (BCK)
(Percentages shown are based on Net Assets)

Principal              
Amount       Option Call      
(000)  
 
Description  Provisions1   Value 
 
      LONG-TERM INVESTMENTS—152.4%         
      California—152.4%         
$     6,500     Benicia Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Ser. B, Zero Coupon,         
         8/01/23, MBIA  No Opt. Call $ 3,160,690   
1,095     Cabrillo Cmnty. Coll. Dist., Univ. & Coll. Impvts. Ad Valorem Ppty. Tax GO, 5.00%,         
         8/01/28, MBIA  08/17 @ 100    1,157,525   
4,000     California GO, 5.00%, 6/01/31, AMBAC  12/14 @ 100    4,170,080   
1,000     California St. Univ., Coll. & Univ. RB, Ser. C, 5.00%, 11/01/38, MBIA  11/15 @ 100    1,045,370   
      Ceres Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO,         
3,055        Ser. B, Zero Coupon, 8/01/30, FGIC  08/12 @ 34.887    847,304   
3,180        Ser. B, Zero Coupon, 8/01/31, FGIC  08/12 @ 32.868    830,934   
3,300        Ser. B, Zero Coupon, 8/01/32, FGIC  08/12 @ 30.966    812,394   
3,440        Ser. B, Zero Coupon, 8/01/33, FGIC  08/12 @ 29.174    797,839   
3,575        Ser. B, Zero Coupon, 8/01/34, FGIC  08/12 @ 27.782    789,575   
3,275        Ser. B, Zero Coupon, 8/01/35, FGIC  08/12 @ 26.186    681,822   
      City of Los Angeles, Swr. RB,         
5,000        Ser. A, 5.00%, 6/01/27, MBIA  06/13 @ 100    5,196,750   
6,025        Ser. A, 5.00%, 6/01/32, FGIC  06/12 @ 100    6,240,333   
11,125     City of Santa Rosa, Swr. Impvts. RB, Ser. B, Zero Coupon, 9/01/27, AMBAC  No Opt. Call   4,377,020   
6,500 2   Dept. of Wtr. Res., Elec., Pwr. & Lt. RB, Ser. A, 5.25%, 5/01/12  N/A   6,975,865   
      East Bay Mun. Util. Dist.,         
1,000        Swr. Impvts. RB, Ser. A, 5.00%, 6/01/33, AMBAC  06/17 @ 100    1,055,580   
3,000        Wtr. Util. Impvts. RB, Ser. A, 5.00%, 6/01/37, FGIC  06/17 @ 100    3,159,240   
2,385     Edl. Facs. Auth., Univ. & Coll. Impvts. RB, Scripps Coll. Proj., 5.00%, 8/01/31, MBIA  08/11 @ 100    2,445,174   
2,915     Eureka Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Election 2002 Proj.,         
         Zero Coupon, 8/01/34, MBIA  No Opt. Call   812,119   
2,750     Hollister Joint Pwrs. Fing. Auth., Swr. RB, Ser. 1, 5.00%, 6/01/32, FSA  06/16 @ 100    2,872,787   
4,500     Infrastructure & Econ. Dev. Bank Pub. Impvts., Misc. RB, Rand Corp. Proj., Ser. A, 5.25%,         
         4/01/42, AMBAC  04/12 @ 100    4,673,745   
2,600 2   Kaweah Delta Hlth. Care Dist., Hlth., Hosp. & Nursing Home RB, 6.00%, 8/01/12  N/A   2,900,898   
2,000     Long Beach Unified Sch. Dist., Sch. Impvts. Ad Valorem Tax GO, Ser. D, 5.00%, 8/01/31, FSA  08/10 @ 101    2,058,160   
      Los Angeles Dept. of Wtr. & Pwr.,         
5,000        Wtr. RB, Ser. A, 5.00%, 7/01/43, FGIC  07/12 @ 100    5,144,350   
5,000        Wtr. Util. Impvts. RB, Ser. A, 5.125%, 7/01/41, FGIC  07/11 @ 100    5,137,150   
3,000 2   Los Angeles Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Ser. E, 5.125%,         
         7/01/12, MBIA  N/A   3,183,510   
5,000     Northern California Pwr. Agcy., Elec. Pwr. & Lt. RB, Hydroelectric Proj., Ser. A, 5.00%,         
         7/01/28, MBIA  07/08 @ 101    5,095,700   
1,250     Poway Redev. Agcy. TA, 5.00%, 6/15/33, MBIA  06/17 @ 100    1,310,313   
5,000     Pub. Wks. Brd., Pub. Impvts. Lease Abatement RB, Ser. A, 5.00%, 12/01/27, AMBAC  12/12 @ 100    5,182,200   
5,000     Riverside Unified Sch. Dist., Sch. Impvts. Ad Valorem Ppty. Tax GO, Ser. A, 5.00%,         
         2/01/27, FGIC  02/12 @ 101    5,186,800   
5,295     San Diego Cnty. Wtr. Auth., Wtr. Util. Impvts. Wtr. COP, Ser. A, 5.00%, 5/01/32, MBIA  05/12 @ 101    5,500,658   
4,805     San Diego Redev. Agcy. TA, Ctr. City Proj., Ser. A, 5.00%, 9/01/28, MBIA  09/11 @ 101    4,972,262   
4,000     San Diego St. Univ. RB, Ser. A, 5.00%, 3/01/37, MBIA  03/12 @ 100    4,136,240   
20,000     San Joaquin Hills Transp. Corridor Agcy., Hwy. Tolls RB, Ser. A, Zero Coupon, 1/15/31, MBIA  No Opt. Call   6,752,200   
6,000     San Jose Fin. Auth., Lease Abatement RB, Civic Ctr. Proj., Ser. B, 5.00%, 6/01/37, AMBAC  06/12 @ 100    6,162,720   
3,000     Tustin Unified Sch. Dist., Sch. Impvts. ST, Cmnty. Facs. Dist. 97-1 Proj., Ser. A, 5.00%,         
         9/01/38, FSA  09/12 @ 100    3,083,370   

1



BlackRock California Insured Municipal Income Trust (BCK) (continued)
(Percentages shown are based on Net Assets)

Principal              
Amount       Option Call      
(000)  
 
Description  Provisions1   Value  
      California— (cont'd)         
$     4,000     Westlands Wtr. Dist., Wtr. Util. Impvts. Wtr. COP, 5.00%, 9/01/34, MBIA  09/12 @ 101
$ 
4,124,560
 
      Total Long-Term Investments (cost $116,427,175)   
 
122,033,237
 
Shares              
(000)              
      MONEY MARKET FUND—5.0%         
4,021 3,4   CMA California Mun. Money Fund, 3.25% (cost $4,020,967)   
 
4,020,967
 
Total Investments —157.4% (cost $120,448,1425)    $  126,054,204  
Other assets in excess of liabilities —0.7%      543,666  
Preferred shares at redemption value, including dividends payable —(58.1)%   
 
(46,511,467
) 
Net Assets Applicable to Common Shareholders —100%   
$ 
80,086,403
 

     
1      Date (month/year) and price of the earliest optional call or redemption. There may be other call provisions at varying prices at later dates.
 
2      This bond is prerefunded. U.S. government securities, held in escrow, are used to pay interest on this security, as well as retire the bond in full at the date indicated, typically at a premium to par.
 
3      Represents an investment in an affiliate.
 
4      Represents current yield as of May 31, 2007.
 
5      Cost for federal income tax purposes is $120,451,115. The net unrealized appreciation on a tax basis is $5,603,089, consisting of $5,702,488 gross unrealized appreciation and $99,399 gross unrealized depreciation.
 

The value (market value plus accrued interest) of securities that are covered by insurance, which ensures the payment of principal and interest, represent approximately 93.0% of the Trust's managed assets.

AMBAC    —    20.6%
FGIC    —    23.8%
FSA    —    6.4%
MBIA    —    39.0%
Other    —    3.2%

 
KEY TO ABBREVIATIONS
 
AMBAC      American Municipal Bond Assurance Corp.    MBIA      Municipal Bond Insurance Assoc. 
COP      Certificate of Participation    RB      Revenue Bond 
FGIC      Financial Guaranty Insurance Co.    ST      Special Tax 
FSA      Financial Security Assurance    TA      Tax Allocation 
GO      General Obligation         
  

2


Item 2. Controls and Procedures.

(a) The Registrant's principal executive and principal financial officers have evaluated the Registrant's disclosure controls and procedures within 90 days of this filing and have concluded, as of that date, that the Registrant’s disclosure controls and procedures were reasonably designed to ensure that information required to be disclosed by the Registrant in this Form N-Q was recorded, processed, summarized, and reported within the required time periods and that information to be disclosed by the Registrant in this Form N-Q was accumulated and communicated to the Registrant’s management, including its principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure.

(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 (17 CFR 270.30a -3(d)) 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.

Separate certifications of the Registrant’s Principal Executive and Financial Officers pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 are attached as EX-99.CERT.


SIGNATURES

          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.

(Registrant) 
BlackRock California Insured Municipal Income Trust
   
By: 
     /s/ Donald C. Burke
Name: Donald C. Burke
Title: Treasurer and Principal Financial Officer
Date: July 25, 2007

          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/ Robert S. Kapito
Name: Robert S. Kapito
Title: President and Principal Executive Officer
Date: July 25, 2007
   
By: 
     /s/ Donald C. Burke
Name: Donald C. Burke
Title: Treasurer and Principal Financial Officer
Date: July 25, 2007