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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 811-07156

Name of Fund: BlackRock MuniYield Florida Insured Fund (MFT)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock
MuniYield Florida Insured Fund, 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing
address: P.O. Box 9011, Princeton, NJ, 08543-9011

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

Date of fiscal year end: 10/31/2008

Date of reporting period: 11/01/2007 – 01/31/2008

Item 1 – Schedule of Investments

BlackRock MuniYield Florida Insured Fund     
Schedule of Investments as of January 31, 2008 (Unaudited)    (in Thousands) 
 
    Face         
    Amount    Municipal Bonds    Value 
 
 
 
 District of Columbia - 0.8%    $ 1,000    Metropolitan Washington Airports Authority, D.C., Airport System Revenue Bonds, AMT, Series A,     
        5.25% due 10/01/2032 (f)    $ 1,009 
 
 
 
 Florida - 140.2%    1,300    Alachua County, Florida, School Board, COP, 5.25% due 7/01/2029 (b)    1,320 
   
 
 
    1,430    Bay County, Florida, Sales Tax Revenue Bonds, 5% due 9/01/2027 (b)    1,463 
   
 
 
    700    Boynton Beach, Florida, Utility System Revenue Refunding Bonds, 6.25% due 11/01/2020 (e)(f)    847 
   
 
 
    2,000    Brevard County, Florida, Health Facilities Authority, Healthcare Facilities Revenue Bonds (Health     
        First Inc. Project), 5% due 4/01/2036    1,947 
   
 
 
    1,720    Broward County, Florida, Educational Facilities Authority Revenue Bonds (Nova Southeastern     
        University), 5% due 4/01/2031 (c)    1,773 
   
 
 
    1,100    Broward County, Florida, HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Series E, 5.90% due     
        10/01/2039 (g)(h)    1,203 
   
 
 
    1,000    Daytona Beach, Florida, Utility System Revenue Refunding Bonds, Series B, 5% due 11/15/2027 (f)    1,029 
   
 
 
    1,000    Deltona, Florida, Transportation Capital Improvement Revenue Bonds, 5.125% due 10/01/2026 (k)    1,040 
   
 
 
    1,000    Emerald Coast, Florida, Utilities Authority, System Revenue Bonds, 5.25% due 1/01/2036 (f)    1,047 
   
 
 
    1,000    Flagler County, Florida, Capital Improvement Revenue Bonds, 5% due 10/01/2035 (k)    1,020 
   
 
 
    975    Florida HFA, Housing Revenue Bonds (Brittany Rosemont Apartments), AMT, Series C-1, 6.75% due     
        8/01/2014 (b)    977 
   
 
 
    1,540    Florida Housing Finance Corporation, Homeowner Mortgage Revenue Bonds, AMT, Series 11, 5.95%     
        due 1/01/2032 (i)    1,561 
   
 
 
    320    Florida Housing Finance Corporation, Homeowner Mortgage Revenue Refunding Bonds, AMT,     
        Series 4, 6.25% due 7/01/2022 (i)    338 
   
 
 
    1,000    Florida State Board of Education, Capital Outlay, GO, Public Education, Series B, 5% due 6/01/2031 (f)    1,020 
   
 
 
    6,190    Florida State Board of Education, Lottery Revenue Bonds, Series A, 6% due 7/01/2010 (f)(l)    6,779 
   
 
 
    1,000    Florida State Governmental Utility Authority, Utility Revenue Bonds (Lehigh Utility System), 5.125%     
        due 10/01/2033 (b)    1,023 
   
 
 
    1,860    Florida State Turnpike Authority, Turnpike Revenue Bonds (Department of Transportation), Series B,     
        5% due 7/01/2030    1,888 
   
 
 
    1,250    Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health     
        System), Series C, 5.25% due 11/15/2036    1,262 
   
 
 
    1,340    Hillsborough County, Florida, HFA, S/F Mortgage Revenue Bonds, AMT, Series 1, 5.375% due     
        10/01/2049 (g)(h)    1,404 
   
 
 
    2,000    Hillsborough County, Florida, IDA, Hospital Revenue Bonds (H. Lee Moffitt Cancer Center Project),     
        Series A, 5.25% due 7/01/2037    1,976 
 
 
 

Portfolio Abbreviations
To simplify the listings of BlackRock MuniYield Florida Insured Fund's portfolio holdings in the Schedule of Investments, we have
abbreviated the names of many of the securities according to the list below.

AMT    Alternative Minimum Tax (subject to)    IDA    Industrial Development Authority 
COP    Certificates of Participation    IDR    Industrial Development Revenue Bonds 
GO    General Obligation Bonds    S/F    Single-Family 
HFA    Housing Finance Agency         

1

BlackRock MuniYield Florida Insured Fund     
Schedule of Investments as of January 31, 2008 (Unaudited)    (in Thousands) 
 
Face         
Amount    Municipal Bonds    Value 
 
 
$ 6,000    Hillsborough County, Florida, School Board, COP, 5.375% due 7/01/2009 (k)(l)    $ 6,274 
 
 
1,000    Hillsborough County, Florida, School Board, COP, 5% due 7/01/2029 (k)    1,001 
 
 
1,000    Jacksonville, Florida, Economic Development Commission, Health Care Facilities Revenue Bonds     
    (Mayo Clinic-Jacksonville), Series A, 5.50% due 11/15/2036 (k)    1,065 
 
 
750    Jacksonville, Florida, Economic Development Commission, Health Care Facilities Revenue Bonds     
    (Mayo Clinic-Jacksonville), Series B, 5.50% due 11/15/2036 (k)    799 
 
 
1,140    Jacksonville, Florida, Economic Development Commission, IDR (Metropolitan Parking Solutions     
    Project), AMT, 5.50% due 10/01/2030 (a)    1,079 
 
 
1,455    Jacksonville, Florida, Guaranteed Entitlement Revenue Refunding and Improvement Bonds, 5.25%     
    due 10/01/2032 (f)    1,504 
 
 
1,000    Jacksonville, Florida, HFA, Homeowner Mortgage Revenue Refunding Bonds, AMT, Series A-1,     
    5.625% due 10/01/2039 (g)(h)    1,030 
 
 
2,875    Jacksonville, Florida, Health Facilities Authority, Hospital Revenue Bonds (Baptist Medical Center     
    Project), 5% due 8/15/2037 (i)    2,925 
 
 
1,225    Jacksonville, Florida, Port Authority, Seaport Revenue Bonds, AMT, 5.625% due 11/01/2026 (k)    1,265 
 
 
2,280    Jacksonville, Florida, Sales Tax Revenue Bonds, 5% due 10/01/2027 (k)    2,339 
 
 
2,000    Lakeland, Florida, Electric and Water Revenue Refunding Bonds, Series A, 5% due 10/01/2028 (k)    2,033 
 
 
1,000    Lee County, Florida, Airport Revenue Bonds, AMT, Series A, 6% due 10/01/2029 (i)    1,058 
 
 
2,285    Lee County, Florida, Capital Revenue Bonds, 5.25% due 10/01/2023 (b)    2,444 
 
 
1,800    Lee County, Florida, HFA, S/F Mortgage Revenue Bonds (Multi-County Program), AMT, Series A-2,     
    6% due 9/01/2040 (g)(h)    2,015 
 
 
2,000    Lee Memorial Health System, Florida, Hospital Revenue Bonds, Series A, 5% due 4/01/2032 (b)    2,020 
 
 
1,000    Leesburg, Florida, Capital Improvement Revenue Bonds, 5.25% due 10/01/2034 (f)    1,045 
 
 
1,000    Manatee County, Florida, HFA, Homeowner Revenue Bonds, AMT, Series A, 5.90%     
    due 9/01/2040 (g)(h)    1,085 
 
 
1,000    Marco Island, Florida, Utility System Revenue Bonds, 5% due 10/01/2033 (k)    1,022 
 
 
1,000    Martin County, Florida, Utilities System Revenue Bonds, 5.125% due 10/01/2033 (b)    1,023 
 
 
2,000    Miami Beach, Florida, Water and Sewer Revenue Bonds, 5.75% due 9/01/2025 (b)    2,117 
 
 
6,300    Miami-Dade County, Florida, Aviation Revenue Bonds, AMT, Series A, 5% due 10/01/2033 (i)    6,272 
 
 
5,000    Miami-Dade County, Florida, Aviation Revenue Bonds (Miami International Airport), AMT,     
    Series A, 6% due 10/01/2024 (f)    5,261 
 
 
2,000    Miami-Dade County, Florida, Educational Facilities Authority Revenue Bonds (University of Miami),     
    Series A, 5.75% due 4/01/2010 (b)(l)    2,163 
 
 
1,000    Miami-Dade County, Florida, Expressway Authority, Toll System Revenue Bonds, Series B, 5.25%     
    due 7/01/2027 (f)    1,038 
 
 
3,875    Miami-Dade County, Florida, Expressway Authority, Toll System Revenue Bonds, Series B, 5% due     
    7/01/2033 (f)    3,896 
 
 
1,200    Miami-Dade County, Florida, HFA, Home Ownership Mortgage Revenue Bonds, AMT, Series A,     
    5.55% due 10/01/2049 (g)(h)    1,280 
 
 
1,655    Miami-Dade County, Florida, IDA, IDR (BAC Funding Corporation Project), Series A, 5.375%     
    due 10/01/2030 (b)    1,745 
 
 

2

BlackRock MuniYield Florida Insured Fund     
Schedule of Investments as of January 31, 2008 (Unaudited)    (in Thousands) 
 
Face         
Amount    Municipal Bonds    Value 
 
 
$ 2,000    Miami-Dade County, Florida, School Board, COP, Series A, 5.50% due 10/01/2009 (i)(l)    $ 2,110 
 
 
1,865    Miami-Dade County, Florida, Solid Waste System Revenue Bonds, 5.25% due 10/01/2030 (k)    1,960 
 
 
4,375    Miami-Dade County, Florida, Special Obligation Revenue Bonds, Sub-Series A, 5.186% due 10/01/2031 (k)(q)    1,269 
 
 
5,735    Miami-Dade County, Florida, Special Obligation Revenue Bonds, Sub-Series A, 5.203%     
    due 10/01/2033 (k)(q)    1,487 
 
 
4,765    Orange County, Florida, Educational Facilities Authority, Educational Facilities Revenue Refunding     
    Bonds (Rollins College Project), 5.50% due 12/01/2032 (b)    5,073 
 
 
1,835    Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Orlando Regional     
    Healthcare), 6% due 12/01/2012 (l)    2,098 
 
 
1,000    Orange County, Florida, Sales Tax Revenue Refunding Bonds, Series A, 5.125% due 1/01/2023 (f)    1,051 
 
 
6,500    Orange County, Florida, School Board, COP, Series A, 5.25% due 8/01/2009 (k)(l)    6,864 
 
 
1,000    Orange County, Florida, School Board, COP, Series A, 5% due 8/01/2032 (f)    999 
 
 
2,190    Orange County, Florida, Tourist Development, Tax Revenue Refunding Bonds, 5%     
    due 10/01/2029 (b)    2,232 
 
 
4,000    Orlando and Orange County, Florida, Expressway Authority Revenue Bonds, Series B, 5%     
    due 7/01/2030 (b)    4,078 
 
 
6,815    Orlando and Orange County, Florida, Expressway Authority Revenue Bonds, Series B, 5%     
    due 7/01/2035 (b)    6,928 
 
 
1,100    Osceola County, Florida, Tourist Development Tax Revenue Bonds, Series A, 5.50%     
    due 10/01/2027 (f)    1,170 
 
 
1,500    Palm Beach County, Florida, Criminal Justice Facilities Revenue Bonds, 7.20% due 6/01/2015 (f)    1,883 
 
 
2,000    Palm Beach County, Florida, School Board, COP, Refunding, Series D, 5.25% due 8/01/2021 (i)    2,133 
 
 
5,000    Palm Beach County, Florida, School Board, COP, Series A, 6% due 8/01/2010 (f)(l)    5,486 
 
 
2,470    Palm Beach County, Florida, School Board, COP, Series A, 5% due 8/01/2029 (f)    2,474 
 
 
1,300    Palm Beach County, Florida, School Board, COP, Series A, 5% due 8/01/2031 (i)    1,332 
 
 
1,500    Panama City, Florida, Water and Sewer Revenue Bonds, Series B, 5.25% due 10/01/2022 (k)    1,593 
 
 
1,000    Pembroke Pines, Florida, Public Improvement Revenue Bonds, Series A, 5% due 10/01/2034 (b)    1,022 
 
 
1,000    Polk County, Florida, Utility System Revenue Bonds, 5.25% due 10/01/2022 (f)    1,065 
 
 
1,055    Port St. Lucie, Florida, Utility Revenue Bonds, 5.25% due 9/01/2024 (k)    1,092 
 
 
2,425    Saint Johns County, Florida, Ponte Vedra Utility System Revenue Bonds, 5% due 10/01/2031 (i)    2,490 
 
 
1,000    Saint Johns County, Florida, Ponte Vedra Utility System Revenue Bonds, 5% due 10/01/2035 (i)    1,027 
 
 
1,400    Saint Johns County, Florida, Sales Tax Revenue Bonds, Series A, 5.25% due 10/01/2031 (b)    1,448 
 
 
1,000    Saint Lucie, Florida, West Services District, Utility Revenue Bonds, 5.25% due 10/01/2034 (k)    1,047 
 
 
1,430    South Florida Water Management District, COP, 5% due 10/01/2036 (b)    1,419 
 
 
1,000    South Lake County, Florida, Hospital District Revenue Bonds (South Lake Hospital Inc.), 5.80% due     
    10/01/2034    1,018 
 
 
2,820    University of Central Florida, COP (UCF Convocation Center), Series A, 5% due 10/01/2035 (f)    2,803 
 
 
2,280    University of Central Florida (UCF) Athletics Association Inc., COP, Series A, 5.25%     
    due 10/01/2034 (f)    2,308 
 
 
1,500    University of North Florida, Capital Improvement Revenue Bonds (Housing Project), 5% due     
    11/01/2032 (f)    1,506 
 
 

3

BlackRock MuniYield Florida Insured Fund         
Schedule of Investments as of January 31, 2008 (Unaudited)    (in Thousands) 
 
    Face             
Amount    Municipal Bonds        Value 
 
 
 
$ 1,640    Village Center Community Development District, Florida, Recreational Revenue Bonds, Series A,         
        5.375% due 11/01/2034 (k)    $ 1,734 
 
 
 
    1,000    Village Center Community Development District, Florida, Recreational Revenue Bonds, Series A,         
        5.125% due 11/01/2036 (k)        1,033 
 
 
 
 
    2,585    Village Center Community Development District, Florida, Utility Revenue Bonds, 5.25%         
        due 10/01/2023 (k)        2,771 
 
 
 
 
    4,030    Village Center Community Development District, Florida, Utility Revenue Bonds, 5.125%         
        due 10/01/2028 (k)        4,166 
 
 
 
 
    1,000    Volusia County, Florida, IDA, Student Housing Revenue Bonds (Stetson University Project), Series A,         
        5% due 6/01/2025 (d)        1,034 
 
 
 
 
    1,000    Volusia County, Florida, IDA, Student Housing Revenue Bonds (Stetson University Project), Series A,         
        5% due 6/01/2035 (d)        1,014 
 
 
 
 
 Puerto Rico - 2.6%    1,000    Puerto Rico Electric Power Authority, Power Revenue Bonds, Series TT, 5% due 7/01/2037        992 
   
 
 
 
    1,000    Puerto Rico Public Buildings Authority, Government Facilities Revenue Refunding Bonds, Series I,         
        5% due 7/01/2036 (p)        970 
 
 
 
 
    1,145    Puerto Rico Public Finance Corporation, Commonwealth Appropriation Revenue Bonds, Series E,         
        5.70% due 2/01/2010 (l)        1,217 
 
 
 
 
        Total Municipal Bonds (Cost - $169,082) - 143.6%        174,120 
 
 
 
 
Municipal Bonds Transferred to Tender Option Bond Trusts (n)
 Florida - 14.4%    3,300    Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT,         
        Series A, 5% due 10/01/2040 (o)        3,145 
 
 
 
 
    6,960    Miami-Dade County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Miami Children's     
        Hospital), Series A, 5.625% due 8/15/2018 (b)        7,736 
 
 
 
 
    2,000    Santa Rosa County, Florida, School Board, COP, Revenue Refunding Bonds, Series 2, 5.25% due 2/01/2026 (f)        2,040 
 
 
 
 
    4,000    South Broward, Florida, Hospital District, Hospital Revenue Bonds, 5.625% due 5/01/2032 (k)        4,503 
 
 
 
 
 Puerto Rico - 6.4%    7,100    Puerto Rico Public Finance Corporation, Commonwealth Appropriation Revenue Bonds, Series A, 5.375% due         
        8/01/2011 (k)(l)        7,753 
 
 
 
 
        Total Municipal Bonds Transferred to Tender Option Bond Trusts (Cost - $24,109) - 20.8%        25,177 
 
 
 
 
    Shares             
    Held    Short-Term Securities         
 
 
 
 
    3,354    CMA Florida Municipal Money Fund, 2.12% (j)(m)        3,354 
 
 
 
 
        Total Short-Term Securities (Cost - $3,354) - 2.8%        3,354 
 
 
 
 
        Total Investments (Cost - $196,545*) - 167.2%        202,651 
        Other Assets Less Liabilities - 2.0%        2,465 
        Liability for Trust Certificates, Including Interest Expense Payable - (9.8%)        (11,843) 
        Preferred Shares, at Redemption Value - (59.4%)        (72,025) 
           
 
        Net Assets Applicable to Common Shares - 100.0%    $ 121,248 
           

4

BlackRock MuniYield Florida Insured Fund     
Schedule of Investments as of January 31, 2008 (Unaudited)    (in Thousands) 
 
 
         * The cost and unrealized appreciation (depreciation) of investments as of January 31, 2008, as computed for     
             federal income tax purposes, were as follows:     
             Aggregate cost    $ 185,177     
   
   
             Gross unrealized appreciation    $ 7,005     
             Gross unrealized depreciation    (1,211)     
   
   
             Net unrealized appreciation    $ 5,794     
   
   

(a)      ACA Insured.
 
(b)      AMBAC Insured.
 
(c)      Assured Guaranty Insured.
 
(d)      CIFG Insured.
 
(e)      Escrowed to maturity.
 
(f)      FGIC Insured.
 
(g)      FHLMC Collateralized.
 
(h)      FNMA/GNMA Collateralized.
 
(i)      FSA Insured.
 
(j)      Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows:
 
    Net    Dividend 
Affiliate    Activity    Income 
 
 
CMA Florida Municipal Money Fund    1,509    $13 
 
 

(k)      MBIA Insured.
 
(l)      Prerefunded.
 
(m)      Represents the current yield as of January 31, 2008.
 
(n)      Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction.
 
(o)      XL Capital Insured.
 
(p)      Commonwealth Guaranteed.
 
(q)      Represents a zero coupon; the interest rate shown reflects the effective yield at the time of purchase.
 

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 13a-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 MuniYield Florida Insured Fund

By: /s/ Donald C. Burke

  Donald C. Burke
Chief Executive Officer of
BlackRock MuniYield Florida Insured Fund

  Date: March 24, 2008

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/ Donald C. Burke
Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock MuniYield Florida Insured Fund

  Date: March 24, 2008

  By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock MuniYield Florida Insured Fund

Date: March 24, 2008