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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 811-21051

Name of Fund: BlackRock Maryland Municipal Bond Trust (BZM)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Anne F. Ackerley, Chief Executive Officer, BlackRock
Maryland Municipal Bond Trust, 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: 08/31/2010

Date of reporting period: 05/31/2010

Item 1 – Schedule of Investments

Schedule of Investments May 31, 2010 (Unaudited)

BlackRock Maryland Municipal Bond Trust (BZM)
(Percentages shown are based on Net Assets)

   Par   
Municipal Bonds  (000)  Value 
       Maryland — 115.6%     
Corporate — 1.0%     
Maryland EDC, Refunding RB, Potomac     
Electric Power Co., 6.20%, 9/01/22                   $ 250         $ 286,107
County/City/Special District/School District — 38.6%   
City of Annapolis Maryland, Tax     
   Allocation Bonds, Park Place Project,     
   Series A, 5.35%, 7/01/34  495  408,469 
City of Baltimore Maryland, Special Tax     
   Bonds, Special Obligation, Harborview     
   Lot No. 2, 6.50%, 7/01/31  993  958,722 
County of Anne Arundel Maryland, RB,     
   Community College Project, 5.25%,     
   9/01/28  1,870  1,902,632 
County of Baltimore Maryland, GO,     
   Metropolitan District:     
       67th Issue, 5.00%, 6/01/22  2,000  2,058,680 
       68th Issue, 5.00%, 8/01/28  2,000  2,096,760 
County of Frederick Maryland, Special     
   Tax Bonds, Urbana Community     
   Development Authority, 6.63%,     
   7/01/25  1,000  1,000,100 
County of Montgomery Maryland, RB,     
   Metrorail Garage Projects:     
       5.00%, 6/01/23  500  528,620 
       5.00%, 6/01/24  1,435  1,517,139 
County of Prince George's Maryland, SO,     
   National Harbor Project, 5.20%,     
   7/01/34  1,500  1,298,100 
11,769,222
Education — 16.3%     
Maryland Health & Higher Educational     
   Facilities Authority, RB:     
       Board of Child Care, 5.38%,     
       7/01/32  2,000  2,017,000 
       Loyola College Issue, 5.00%,     
       10/01/39  2,000  2,000,620 
Maryland Industrial Development     
   Financing Authority, RB, Our Lady of     
   Good Counsel School, Series A,     
   6.00%, 5/01/35  1,000  957,630 
4,975,250
Health — 29.8%     
County of Baltimore Maryland,     
   Refunding RB, Oak Crest Village Inc.     
   Facility, Series A, 5.00%, 1/01/37  1,000  892,170 
County of Howard Maryland, Refunding     
   RB, Vantage House Facility, Series A,     
   5.25%, 4/01/33  500  388,670 

     Par   
Municipal Bonds    (000)  Value 
       Maryland (concluded)       
Health (concluded)       
Gaithersburg Maryland, Refunding RB,       
   Asbury Maryland Obligation, Series B,     
   6.00%, 1/01/23  $ 250 $  256,583 
Maryland Health & Higher Educational       
   Facilities Authority, RB:       
       Anne Arundel Health System,       
       5.00%, 7/01/40    1,000  992,260 
       Carroll County General Hospital,       
       6.00%, 7/01/37    1,990  2,026,576 
       Peninsula Regional Medical Center,     
       5.00%, 7/01/36    1,000  1,011,460 
       Union Hospital of Cecil County       
       Issue, 5.63%, 7/01/32    2,000  2,022,060 
Maryland Health & Higher Educational       
   Facilities Authority, Refunding RB:       
       Doctor's Community Hospital,       
       5.75%, 7/01/38    500  480,475 
       University of Maryland Medical       
       System, 5.13%, 7/01/39    1,000  1,014,100 
9,084,354
Housing — 6.6%       
Maryland Community Development       
   Administration, RB:       
       AMT, 5.10%, 9/01/37    1,000  1,007,310 
       Residential, Series A, 5.05%,       
       9/01/39    500  510,110 
       Residential, Series B, 4.75%,       
       9/01/39    500  502,680 

2,020,100
Transportation — 8.2%     
Maryland EDC, RB, Transportation     
   Facilities Project, Series A, 5.75%,     
   6/01/35  500  510,290 
Maryland State Transportation Authority,     
   RB, Baltimore/Washington     
   International Airport, Series B, AMT     
   (AMBAC), 5.13%, 3/01/24  2,000  1,985,220 
2,495,510
Utilities — 15.1%     
City of Baltimore Maryland, Refunding     
   RB, Wastewater Projects, Series A     
   (NPFGC):     
       5.20%, 7/01/32  2,500  2,561,300 
       5.13%, 7/01/42  2,000  2,022,620 
4,583,920
Total Municipal Bonds in Maryland    35,214,463 

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:

AGM  Assured Guaranty Municipal Corp.  GO  General Obligation Bonds 
AMBAC  American Municipal Bond Assurance Corp.  NPFGC  National Public Finance Guarantee Corp. 
AMT  Alternative Minimum Tax (subject to)  RB  Revenue Bonds 
EDC  Economic Development Corp.  SO  Special Obligation 

BLACKROCK MARYLAND MUNICIPAL BOND TRUST

MAY 31, 2010

1

Schedule of Investments (continued)

BlackRock Maryland Municipal Bond Trust (BZM)
(Percentages shown are based on Net Assets)

  Par   
Municipal Bonds  (000)  Value 
       District of Columbia — 3.5%     
Transportation — 3.5%     
Washington Metropolitan Area Transit     
   Authority, RB, Transit, Series A,     
    5.13%, 7/01/32                                          $ 1,000         $ 1,067,710
Total Municipal Bonds in the District of Columbia  1,067,710 
       Guam — 0.8%     
County/City/Special District/School District — 0.8%   
Territory of Guam, RB, Section 30,     
Series A, 5.63%, 12/01/29                                                   250 257,322
Total Municipal Bonds in Guam    257,322 
       Multi-State — 7.2%     
Housing — 7.2%     
Centerline Equity Issuer Trust, 7.20%,     
11/15/52 (a)(b)                                                 2,000             2,190,600
Total Municipal Bonds in Multi-State    2,190,600 
       Puerto Rico — 16.2%     
State — 5.3%     
Commonwealth of Puerto Rico, GO,     
   Refunding, Public Improvement,     
   Series A-4 (AGM), 5.25%, 7/01/30  130  135,355 
Puerto Rico Public Buildings Authority,     
   Refunding RB, Government Facilities,     
   Series D, 5.38%, 7/01/33  350  352,145 
Puerto Rico Sales Tax Financing Corp.,     
   RB, First Sub-Series A, 6.38%,     
   8/01/39  1,000  1,122,800 
 1,610,300
Tobacco — 4.3%     
Children's Trust Fund, Refunding RB,     
Asset-Backed, 5.50%, 5/15/39                           1,500          1,303,635
Transportation — 6.6%     
Puerto Rico Highway & Transportation     
   Authority, Refunding RB:     
       Series CC (AGM), 5.25%, 7/01/36  895  946,257 
       Series D, 5.25%, 7/01/12 (c)  1,000  1,088,620 
2,034,877
Total Municipal Bonds in Puerto Rico    4,948,812 
Total  Municipal Bonds – 143.3%                                           43,678,907
Municipal Bonds Transferred to Tender     
Option Bond Trusts (d)     
       Maryland — 10.4%     
Transportation — 10.4%     
Maryland State Transportation Authority,     
   RB, Transportation Facility Project     
    (AGM), 5.00%, 7/01/41                                  3,000          3,173,640
Total Municipal Bonds Transferred to     
Tender Option Bond Trusts – 10.4%    3,173,640 

  Value 
Total Long-Term Investments   
(Cost – $46,020,577) – 153.7%                                 $ 46,852,547
Short-Term Securities Shares
FFI Institutional Tax-Exempt Fund,   
0.25% (e)(f) 501,696                                                         501,696
Total Short-Term Securities   
(Cost – $501,696) – 1.7%                                                 501,696
Total Investments (Cost – $46,522,273*) – 155.4%  47,354,243 
Other Assets Less Liabilities – 2.0%  625,475 
Liability for Trust Certificates, Including Interest   
   Expense and Fees Payable – (4.9)%  (1,501,764) 
Preferred Shares, at Redemption Value – (52.5)%  (16,002,149) 
Net Assets Applicable to Common Shares – 100.0% $  30,475,805 

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

May 31, 2010, as computed for federal income tax purposes, were as

Aggregate follows: cost  $ 44,915,826 
Gross unrealized appreciation  $ 1,542,830 
Gross unrealized depreciation  (604,413) 
Net unrealized appreciation  $ 938,417 

(a) Security exempt from registration under Rule 144A of the Securities Act
of 1933. These securities may be resold in transactions exempt from
registration to qualified institutional investors.
(b) Security represents a beneficial interest in a trust. The collateral
deposited into the trust is federally tax-exempt revenue bonds issued by
various state or local governments, or their respective agencies or
authorities. The security is subject to remarketing prior to its stated
maturity.
(c) US government securities, held in escrow, are used to pay interest on this
security as well as to retire the bond in full at the date indicated, typically
at a premium to par.
(d) 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 financing transaction.
(e) Represents the current yield as of report date.
(f) Investments in companies considered to be an affiliate of the Trust
during the period, for purposes of Section 2(a)(3) of the Investment

Company Act of 1940, as amended, were as follows:     
  Shares Held    Shares Held     
  at August    at May 31,     
Affiliate  31, 2009  Net Activity  2010  Income   
FFI Institutional           
Tax-Exempt Fund  1,200,364  (698,668)  501,696  $722

2 BLACKROCK MARYLAND MUNICIPAL BOND TRUST

MAY 31, 2010

Schedule of Investments (concluded)

BlackRock Maryland Municipal Bond Trust (BZM)

• 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 Trust'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 Trust's policy regarding valuation of investments and
other significant accounting policies, please refer to the Trust’s most recent
financial statements as contained in its semi-annual report.

The following table summarizes the inputs used as of May 31, 2010 in
determining the fair valuation of the Trust's investments:

Investments in Securities
Valuation Inputs  Level 1  Level 2  Level 3  Total 
Assets:         
Long-Term         
   Investments1  —   $46,852,547           —   $46,852,547 
Short-Term         
   Securities  $ 501,696  —           —  501,696 
Total  $ 501,696   $46,852,547           —   $47,354,243 

1 See above Schedule of Investments for values in each sector.

BLACKROCK MARYLAND MUNICIPAL BOND TRUST

MAY 31, 2010

3

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 Maryland Municipal Bond Trust

By: /s/ Anne F. Ackerley
Anne F. Ackerley
Chief Executive Officer of
BlackRock Maryland Municipal Bond Trust

Date: July 23, 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 Maryland Municipal Bond Trust

Date: July 23, 2010

By: /s/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock Maryland Municipal Bond Trust

Date: July 23, 2010