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- 07270 )  
 
Exact name of registrant as specified in charter:   Putnam Municipal Bond Fund  
 
Address of principal executive offices: One Post Office Square, Boston, Massachusetts 02109  
 
Name and address of agent for service:   Beth S. Mazor, Vice President  
  One Post Office Square  
  Boston, Massachusetts 02109  
 
Copy to:   John W. Gerstmayr, Esq.  
  Ropes & Gray LLP  
  One International Place  
  Boston, Massachusetts 02110  
 
Registrant’s telephone number, including area code:   (617) 292-1000    
 
Date of fiscal year end: April 30, 2008    
 
Date of reporting period: July 31, 2007    
  
Item 1. Schedule of Investments:    


Putnam Municipal Bond Fund
The fund's portfolio
7/31/07 (Unaudited)

Key to abbreviations
AMBAC -- AMBAC Indemnity Corporation
COP -- Certificate of Participation
FGIC -- Financial Guaranty Insurance Company
FHA Insd. -- Federal Housing Administration Insured
FHLMC Coll. -- Federal Home Loan Mortgage Corporation Collateralized
FNMA Coll. -- Federal National Mortgage Association Collateralized
FSA -- Financial Security Assurance
GNMA Coll. -- Government National Mortgage Association Collateralized
G.O. Bonds -- General Obligation Bonds
MBIA -- MBIA Insurance Company
PSFG -- Permanent School Fund Guaranteed
Radian Insd. -- Radian Group Insured
U.S. Govt. Coll. -- U.S. Government Collateralized
VRDN -- Variable Rate Demand Notes
XLCA -- XL Capital Assurance

   
MUNICIPAL BONDS AND NOTES (166.8%)(a)        
 
  Rating(RAT)   Principal amount   Value  

Alabama (1.7%)        
Birmingham, G.O. Bonds, Ser. B, AMBAC, 4 3/4s, 3/1/27        
(SEG)   Aaa   $3,000,000   $3,048,390  
Sylacauga, Hlth. Care Auth. Rev. Bonds (Coosa Valley        
Med. Ctr.), Ser. A, 6s, 8/1/25   B/P   400,000   411,232  
      3,459,622  

 
Alaska (0.4%)        
Northern Tobacco Securitization Corp. Rev. Bonds,        
5 1/2s, 6/1/29 (Prerefunded)   AAA   750,000   793,065  

 
Arizona (2.3%)        
Casa Grande, Indl. Dev. Auth. Rev. Bonds (Casa Grande        
Regl. Med. Ctr.), Ser. A, 7 5/8s, 12/1/29   B+/P   1,175,000   1,284,181  
Marana, Impt. Dist. Special Assmt. Bonds (Tangerine        
Farms Road), 4.6s, 1/1/26   Baa1   780,000   754,556  
Maricopa Cnty., Poll. Control Rev. Bonds (Public        
Service Co. NM), Ser. A, 6.3s, 12/1/26   Baa2   2,000,000   2,025,140  
Pima Cnty., Indl. Dev. Auth. Rev. Bonds (Horizon        
Cmnty. Learning Ctr.), 5.05s, 6/1/25   BBB-   525,000   507,591  
      4,571,468  

 
Arkansas (1.7%)        
Baxter Cnty., Hosp. Rev. Bonds, Ser. B, 5 5/8s, 9/1/28        
(Prerefunded)   Baa2   2,000,000   2,072,200  
Independence Cnty., Poll. Control Rev. Bonds (Entergy        
AR, Inc.), 5s, 1/1/21   A-   600,000   606,936  
Jefferson Cnty., Poll. Control Rev. Bonds (Entergy AR,        
Inc.), 4.6s, 10/1/17   A-   280,000   279,983  
Springdale, Sales & Use Tax Rev. Bonds, FSA, 4.05s,        
7/1/26   Aaa   500,000   496,660  
      3,455,779  

 
California (14.7%)        
Anaheim, City School Dist. G.O. Bonds (Election        
of 2002), MBIA, zero %, 8/1/26   Aaa   2,250,000   927,563  
Azusa, Cmnty. Fac. Dist. Special Tax Bonds (No. 05-1),        
Class 1, 5s, 9/1/27   BB-/P   455,000   449,303  
CA Edl. Fac. Auth. Rev. Bonds        
(U. of the Pacific), 5s, 11/1/21   A2   525,000   538,876  
(Loyola-Marymount U.), MBIA, zero %, 10/1/21   Aaa   1,300,000   693,199  
CA Hlth. Fac. Fin. Auth. Rev. Bonds, AMBAC, 5.293s,        
7/1/17   Aaa   2,400,000   2,402,520  
CA Muni. Fin. Auth. COP (Cmnty. Hosp. Central CA),        
5 1/4s, 2/1/37   Baa2   1,500,000   1,501,110  
CA State G.O. Bonds        
5 1/8s, 4/1/23   A1   750,000   782,813  
5s, 5/1/23   A1   3,000,000   3,104,910  
CA State Dept. of Wtr. Resources Rev. Bonds, Ser. A,        
5 1/2s, 5/1/11   A1   1,000,000   1,059,470  
CA Statewide Cmntys., Dev. Auth. COP (The Internext        
Group), 5 3/8s, 4/1/30   BBB   1,750,000   1,760,535  
Cathedral City, Impt. Board Act of 1915 Special Assmt.        
Bonds (Cove Impt. Dist.), Ser. 04-02, 5.05s, 9/2/35   BB+/P   270,000   266,398  
Chula Vista, Indl. Dev. Rev. Bonds (San Diego Gas),        
Ser. B, 5s, 12/1/27   A1   640,000   651,328  
Duarte, Unified School Dist. G.O. Bonds (Election        
of 1998), Ser. E, FSA, zero %, 11/1/29   Aaa   1,305,000   451,386  
Folsom, Pub. Fin. Wtr. Auth. Rev. Bonds, Ser. A, FSA,        
5s, 12/1/30   Aaa   3,185,000   3,283,289  
Garvey, School Dist. G.O. Bonds (Election of 2004),        
FSA, zero %, 8/1/23   Aaa   1,330,000   635,607  
Golden State Tobacco Securitization Corp. Rev. Bonds        


     
Ser. B, FHLMC Coll., 5 5/8s, 6/1/38 (Prerefunded)   Aaa   1,500,000   1,632,825  
Ser. A-1, 5s, 6/1/33   BBB   1,000,000   934,010  
Ser. 03 A-1, 5s, 6/1/21 (Prerefunded)   AAA   60,000   60,627  
Ser. A-1, 4 1/2s, 6/1/27   BBB   785,000   742,555  
Las Virgenes, Unified School Dist. G.O. Bonds, FSA,        
zero %, 11/1/23   Aaa   1,290,000   614,272  
Orange Cnty., Cmnty. Fac. Dist. Special Tax Rev. Bonds        
(Ladera Ranch No. 02-1), Ser. A, 5.55s, 8/15/33   BBB/P   450,000   457,884  
Roseville, Cmnty. Fac. Special Tax Bonds        
(Dist. No. 1- Westpark), 5 1/4s, 9/1/18   BB/P   875,000   894,023  
(Dist. No. 1 - Fiddyment Ranch), Ser. 1, 5s, 9/1/20   BB/P   255,000   252,338  
Sacramento, Special Tax (North Natomas Cmnty. Fac.),        
Ser. 97-01, 5s, 9/1/20   BB/P   1,205,000   1,212,796  
San Diego Cnty., Wtr. Auth. COP, FGIC, 5.681s, 4/23/08   Aaa   2,000,000   2,029,280  
San Juan, Unified School Dist. G.O. Bonds, FSA, zero        
%, 8/1/19   Aaa   1,000,000   590,530  
Silicon Valley, Tobacco Securitization Auth. Rev.        
Bonds (Santa Clara), Ser. A, zero %, 6/1/36   BBB/F   1,200,000   243,516  
Vallejo, COP (Marine World Foundation), 7.2s, 2/1/26   BBB-/P   1,400,000   1,402,856  
      29,575,819  

 
Colorado (5.3%)        
CO Hlth. Fac. Auth. Rev. Bonds        
(Christian Living Cmntys.), Ser. A, 5 3/4s, 1/1/26   BB-/P   125,000   128,124  
(Evangelical Lutheran), 5 1/4s, 6/1/21   A3   590,000   611,458  
(Evangelical Lutheran), 5s, 6/1/29   A3   350,000   351,712  
CO Pub. Hwy. Auth. Rev. Bonds (E-470 Pub. Hwy.), Ser.        
B, zero %, 9/1/35 (Prerefunded)   Aaa   27,000,000   3,638,790  
CO Springs, Hosp. Rev. Bonds        
6 3/8s, 12/15/30   A3   1,765,000   1,889,256  
6 3/8s, 12/15/30 (Prerefunded)   A3   1,735,000   1,887,836  
Denver, City & Cnty. Arpt. Rev. Bonds, Ser. D, AMBAC,        
7 3/4s, 11/15/13   Aaa   2,000,000   2,214,580  
      10,721,756  

 
Delaware (0.9%)        
GMAC Muni. Mtge. Trust 144A sub. notes        
Ser. A1-3, 5.3s, 10/31/39   A3   500,000   503,095  
Ser. A1-2, 4.9s, 10/31/39   A3   1,000,000   995,110  
New Castle Cnty., Rev. Bonds (Newark Charter School,        
Inc.), 5s, 9/1/30   BBB-   250,000   246,288  
      1,744,493  

 
Florida (5.7%)        
Connerton West, Cmnty. Dev. Dist. Rev. Bonds, Ser. B,        
5 1/8s, 5/1/16   BB-/P   210,000   207,696  
Escambia Cnty., Hlth. Fac. Auth. Rev. Bonds (Baptist        
Hosp. & Baptist Manor), 5 1/8s, 10/1/19   Baa1   1,500,000   1,515,360  
Miami Beach, Hlth. Fac. Auth. Hosp. Rev. Bonds (Mount        
Sinai Med. Ctr.), Ser. A, 6.8s, 11/15/31   Ba1   500,000   543,145  
Okeechobee Cnty., Solid Waste Mandatory Put Bonds        
(Waste Mgt./Landfill), Ser. A, 4.2s, 7/1/09   BBB   375,000   372,071  
Orange Cnty., Hlth. Fac. Auth. Rev. Bonds (Hosp. Hlth.        
Care), Ser. E        
6s, 10/1/26   A2   2,940,000   3,078,650  
6s, 10/1/26 (Prerefunded)   A2   60,000   63,328  
Reunion West, Cmnty. Dev. Dist. Special Assmt. Bonds,        
6 1/4s, 5/1/36   BB-/P   840,000   874,356  
South Bay, Cmnty. Dev. Dist. Rev. Bonds, Ser. B-1,        
5 1/8s, 11/1/09   BB-/P   715,000   714,371  
South Broward, Hosp. Dist. Rev. Bonds (South Broward        
Hosp.), 4 3/4s, 5/1/28   Aa3   2,500,000   2,454,525  
Split Pine, Cmnty. Dev. Dist. Special Assmt. Bonds, Ser. A,        
5 1/4s, 5/1/39   BB-/P   500,000   460,940  
Tampa, Hosp. Rev. Bonds (H. Lee Moffit Cancer &        
Research Inst.), Ser. A, 5 3/4s, 7/1/29   A   500,000   512,655  
Tolomato, Cmnty. Dev. Dist. Special Assmt. Bonds,        
5.4s, 5/1/37   BB-/P   175,000   171,932  
Wentworth Estates, Cmnty. Dev. Dist. Special Assmt.        
Bonds, Ser. B, 5 1/8s, 11/1/12   BB-/P   420,000   415,993  
      11,385,022  

 
Georgia (3.2%)        
Atlanta, Wtr. & Waste Wtr. VRDN, Ser. B, FSA, 3.63s,        
11/1/38   VMIG1   1,390,000   1,390,000  
GA Med. Ctr. Hosp. Auth. Rev. Bonds, MBIA, 6.367s,        
8/1/10   Aaa   400,000   400,516  
Henry Cnty., Wtr. & Swr. Auth. Rev. Bonds, FGIC,        
5 5/8s, 2/1/30 (Prerefunded)   Aaa   1,875,000   1,974,150  
Paulding Cnty., School Dist. G.O. Bonds, 4 3/4s, 2/1/27   AA+   1,500,000   1,525,230  
Rockdale Cnty., Dev. Auth. Solid Waste Disp. Rev.        
Bonds (Visay Paper, Inc.), 7.4s, 1/1/16   B+/P   1,070,000   1,075,532  
      6,365,428  

 
Idaho (0.5%)        
ID Hsg. & Fin. Assn. Rev. Bonds (Single Fam. Mtge.),        
Ser. C-2, FHA Insd., 5.15s, 7/1/29   Aaa   965,000   968,744  

 
Illinois (6.1%)        


     
Chicago, Board of Ed. VRDN, Ser. D-2, CIFG, 3.74s,        
3/1/36   VMIG1   1,200,000   1,200,000  
Chicago, Waste Wtr. Transmission Rev. Bonds, Ser. A,        
MBIA, zero %, 1/1/24   Aaa   1,600,000   745,280  
Cook Cnty., G.O. Bonds, Ser. B, MBIA, 5s, 11/15/29   Aaa   2,750,000   2,846,498  
IL Dev. Fin. Auth. Rev. Bonds (Midwestern U.), Ser. B,        
6s, 5/15/26 (Prerefunded)   AAA   1,600,000   1,734,960  
IL Dev. Fin. Auth. Hosp. Rev. Bonds (Adventist Hlth.        
Syst./Sunbelt Obligation), 5.65s, 11/15/24        
(Prerefunded)   A1   1,500,000   1,572,810  
IL State Toll Hwy. Auth. Rev. Bonds, Ser. A-1, FSA,        
5s, 1/1/23   Aaa   2,250,000   2,358,698  
Kendall & Kane Cntys., Cmnty. United School Dist. G.O.        
Bonds (No. 115 Yorkville), FGIC, zero %, 1/1/21   Aaa   1,075,000   585,682  
Lake Cnty., Cmnty. School Dist. G.O. Bonds (No. 073        
Hawthorn), Ser. 02, FGIC, zero %, 12/1/21   Aaa   1,000,000   516,840  
Montgomery, Special Assmt. Bonds (Lakewood Creek),        
Radian Insd., 4.7s, 3/1/30   AA   700,000   680,050  
      12,240,818  

 
Indiana (3.5%)        
Anderson, Econ. Dev. Rev. Bonds (Anderson U.), 5s,        
10/1/24   BBB/F   135,000   135,608  
Franklin, Cmnty. Multi-School Bldg. Corp. Rev. Bonds        
(First Mtge.), FGIC, 5s, 7/15/26   Aaa   4,215,000   4,367,499  
Hamilton Cnty., Pub. Bldg. Corp. G.O. Bonds (First        
Mtge.), FSA, 5s, 2/1/26   Aaa   2,525,000   2,616,885  
      7,119,992  

 
Iowa (1.7%)        
IA Fin. Auth. Hlth. Care Fac. Rev. Bonds (Care        
Initiatives), 9 1/4s, 7/1/25 (Prerefunded)   AAA   1,465,000   1,759,626  
IA State Rev. Bonds (Honey Creek Premier Destination        
Pk.), FSA, 5s, 6/1/28   Aaa   1,545,000   1,606,383  
      3,366,009  

 
Kansas (0.1%)        
Lawrence, Hosp. Rev. Bonds (Lawrence Memorial Hosp.),        
5 1/4s, 7/1/21   A3   250,000   260,645  

 
Kentucky (1.0%)        
KY Econ. Dev. Fin. Auth. Hlth. Syst. Rev. Bonds        
(Norton Hlth. Care), Ser. A        
6 5/8s, 10/1/28 (Prerefunded)   AAA/P   1,470,000   1,606,931  
6 5/8s, 10/1/28   A-/F   405,000   431,487  
      2,038,418  

 
Louisiana (0.2%)        
LA Pub. Fac. Auth. Rev. Bonds (Pennington Med.        
Foundation), 5s, 7/1/16   A3   400,000   411,180  

 
Maine (0.7%)        
Rumford, Solid Waste Disp. Rev. Bonds (Boise Cascade        
Corp.), 6 7/8s, 10/1/26   Ba3   1,350,000   1,466,019  

 
Maryland (0.2%)        
Baltimore Cnty., Rev. Bonds (Oak Crest Village, Inc.        
Fac.), Ser. A, 5s, 1/1/22   BBB+   475,000   479,598  

 
Massachusetts (13.8%)        
MA State Dev. Fin. Agcy. Rev. Bonds        
(MA Biomedical Research), Ser. C, 6 1/4s, 8/1/20   Aa3   2,850,000   3,032,144  
(Linden Ponds, Inc.), Ser. A, 5 1/2s, 11/15/22   BB/P   425,000   431,970  
MA State Dev. Fin. Agcy. Higher Ed. Rev. Bonds        
(Emerson College), Ser. A, 5s, 1/1/19   A-   310,000   323,708  
MA State Hlth. & Edl. Fac. Auth. Rev. Bonds        
(Civic Investments/HPHC), Ser. A, 9s, 12/15/15        
(Prerefunded)   BBB-/P   1,215,000   1,446,640  
(Jordan Hosp.), Ser. E, 6 3/4s, 10/1/33   BB+   750,000   806,865  
(Med. Ctr. of Central MA), AMBAC, 6.55s, 6/23/22   Aaa   11,500,000   11,744,260  
(Hlth. Care Syst. Covenant Hlth.), Ser. E, 6s, 7/1/31   A   3,000,000   3,195,300  
(UMass Memorial), Ser. D, 5s, 7/1/33   Baa2   500,000   490,015  
MA State Port Auth. Rev. Bonds, U.S. Govt. Coll., 13s,        
7/1/13 (Prerefunded)   Aaa   2,690,000   3,494,875  
MA State School Bldg. Auth. Dedicated Sales Tax Rev.        
Bonds, Ser. A, AMBAC, 4 3/4s, 8/15/32   Aaa   2,750,000   2,778,408  
      27,744,185  

 
Michigan (4.5%)        
Detroit, G.O. Bonds, Ser. A-1, AMBAC, 5 1/4s, 4/1/24   Aaa   1,435,000   1,500,465  
Detroit, City School Dist. G.O. Bonds, Ser. A, FSA,        
6s, 5/1/29   Aaa   1,000,000   1,200,630  
Flint, Hosp. Bldg. Auth. Rev. Bonds (Hurley Med.        
Ctr.), 6s, 7/1/20   Ba1   75,000   77,438  
MI Muni. Board Auth. Rev. Bonds (Clean Wtr. Revolving        
Fund), 5s, 10/1/25   Aaa   1,000,000   1,050,940  
MI State Hosp. Fin. Auth. Rev. Bonds        
(Oakwood Hosp.), Ser. A, 5 3/4s, 4/1/32   A2   1,000,000   1,042,010  


     
(Midmichigan Hlth. Oblig. Group), Ser. A, 5s, 4/15/26   A1   1,775,000   1,802,406  
(Hosp. Sparrow), 5s, 11/15/24   A1   1,600,000   1,621,728  
MI State Strategic Fund, Ltd. Mandatory Put Bonds (Dow        
Chemical), 5 1/2s, 6/1/13   A3   500,000   525,085  
MI State U. VRDN, Ser. A, 3.66s, 8/15/32   VMIG1   205,000   205,000  
      9,025,702  

 
Minnesota (1.9%)        
Cohasset, Poll. Control Rev. Bonds (Allete, Inc.),        
4.95s, 7/1/22   A-   2,500,000   2,515,875  
MN State Hsg. Fin. Agcy. Rev. Bonds (Res. Hsg.), Ser.        
M, 5 3/4s, 1/1/37   Aa1   500,000   529,640  
MN State Hsg. Fin. Agcy. Single Fam. Mtge. Rev. Bonds,        
6.05s, 7/1/31   Aa1   430,000   433,986  
St. Paul, Hsg. & Redev. Auth. Hosp. Rev. Bonds        
(Healtheast), 6s, 11/15/25   Baa3   350,000   379,495  
      3,858,996  

 
Mississippi (2.1%)        
Lowndes Cnty., Solid Waste Disp. & Poll. Control Rev.        
Bonds (Weyerhaeuser Co.)        
Ser. A, 6.8s, 4/1/22   Baa2   500,000   590,395  
Ser. B, 6.7s, 4/1/22   Baa2   530,000   620,370  
MS Bus. Fin. Corp. Poll. Control Rev. Bonds (Syst.        
Energy Resources, Inc.), 5.9s, 5/1/22   BBB   2,000,000   2,003,640  
MS Home Corp. Rev. Bonds (Single Fam. Mtge.)        
Ser. B-2, GNMA Coll., FNMA Coll., 6.45s, 12/1/33   Aaa   510,000   522,306  
Ser. B, GNMA Coll., FNMA Coll., 5 1/2s, 6/1/36   Aaa   435,000   449,177  
      4,185,888  

 
Missouri (3.2%)        
Cape Girardeau Cnty., Indl. Dev. Auth. Hlth. Care Fac.        
Rev. Bonds (St. Francis Med. Ctr.), Ser. A, 5 1/2s,        
6/1/32   A+   1,500,000   1,564,335  
MO Hsg. Dev. Comm. Rev. Bonds (Home Ownership), Ser.        
B, GNMA Coll., FNMA Coll., 4.4s, 3/1/14   AAA   205,000   204,299  
MO State Hlth. & Edl. Fac. Auth. Rev. Bonds (BJC Hlth.        
Syst.)        
5 1/4s, 5/15/32   Aa2   1,000,000   1,027,500  
5 1/4s, 5/15/17   Aa2   2,000,000   2,093,120  
MO State Hsg. Dev. Comm. Mtge. Rev. Bonds (Single Fam.        
Homeowner Loan)        
Ser. A, GNMA Coll., FNMA Coll., 7.2s, 9/1/26   AAA   140,000   142,157  
Ser. A-2, GNMA Coll., 6.3s, 3/1/30   AAA   790,000   802,087  
Ser. C, GNMA Coll., FNMA Coll., 5.6s, 9/1/35   AAA   635,000   663,423  
      6,496,921  

 
Nevada (7.7%)        
Clark Cnty., Arpt. Rev. Bonds, Ser. A-2, FGIC, 5 1/8s,        
7/1/26   Aaa   5,000,000   5,204,750  
Clark Cnty., Impt. Dist. Special Assmt. Bonds        
(Summerlin No. 151), 5s, 8/1/25   BB/P   700,000   704,172  
Clark Cnty., Indl. Dev. Rev. Bonds (Southwest Gas        
Corp.), Ser. A, AMBAC, 6.1s, 12/1/38   Aaa   3,000,000   3,184,230  
Henderson G.O. Bonds (Ltd. Tax -Swr.), FGIC, 5s, 6/1/29   Aaa   3,935,000   4,091,298  
Henderson, Local Impt. Dist. Special Assmt. Bonds        
(No. T-16), 5 1/8s, 3/1/25   BB/P   1,000,000   994,800  
(No. T-17), 5s, 9/1/25   BB/P   225,000   218,475  
(No. T-14), 4 3/4s, 3/1/10   BB/P   1,035,000   1,044,708  
      15,442,433  

 
New Jersey (8.9%)        
NJ Econ. Dev. Auth. Rev. Bonds        
(Cedar Crest Village, Inc.), Ser. A, 7 1/4s, 11/15/31        
(Prerefunded)   AAA/P   650,000   738,660  
(First Mtge. Presbyterian Home), Ser. A, 6 3/8s,        
11/1/31   BB/P   1,000,000   1,042,990  
(Cigarette Tax), 5 3/4s, 6/15/29   Baa2   1,750,000   1,871,485  
NJ Hlth. Care Fac. Fin. Auth. Rev. Bonds        
(Hunterdon Med. Ctr.), Ser. B, 5s, 7/1/26   A-   1,000,000   1,017,220  
(South Jersey Hosp.), 5s, 7/1/26   Baa1   1,685,000   1,693,341  
(South Jersey Hosp.), 5s, 7/1/25   Baa1   355,000   357,268  
NJ State Rev. Bonds (Trans. Syst.), Ser. C, AMBAC,        
zero %, 12/15/24   Aaa   4,800,000   2,156,784  
NJ State Edl. Fac. Auth. Rev. Bonds (Fairleigh        
Dickinson), Ser. C, 6s, 7/1/20   BBB-/F   750,000   819,413  
Passaic Cnty., Impt. Auth. Lease Rev. Bonds (Preakness        
Hlth. Care Ctr.), AMBAC, 5s, 5/1/27   Aaa   5,405,000   5,597,580  
Tobacco Settlement Fin. Corp. Rev. Bonds        
6 3/4s, 6/1/39 (Prerefunded)   AAA   1,100,000   1,261,326  
Ser. 1A, 4 1/2s, 6/1/23   BBB   1,395,000   1,338,419  
      17,894,486  

 
New Mexico (1.4%)        
NM Fin. Auth. Rev. Bonds, Ser. A, MBIA, 5s, 6/15/22   Aaa   750,000   787,763  
NM Mtge. Fin. Auth. Rev. Bonds (Single Fam. Mtge.)        
Ser. D-2, GNMA Coll., FNMA Coll., FHLMC Coll., 5.64s,        
9/1/33   AAA   330,000   336,468  
Ser. F2, Class I, GNMA Coll., FNMA Coll., FHLMC Coll.,        


     
5.6s, 7/1/38   AAA   1,715,000   1,811,434  
      2,935,665  

 
New York (10.1%)        
Metro. Trans. Auth. Dedicated Tax Rev. Bonds, Ser. B,        
MBIA, 5s, 11/15/25   Aaa   3,200,000   3,372,256  
Niagara Cnty., Indl. Dev. Agcy. Rev. Bonds, Ser. C,        
5 5/8s, 11/15/24   Baa2   1,500,000   1,546,440  
NY City, Hsg. Dev. Corp. Rev. Bonds, Ser. A, FGIC, 5s,        
7/1/25   Aaa   500,000   521,880  
NY City, Indl. Dev. Agcy. Rev. Bonds (Liberty-7 World        
Trade Ctr.), Ser. A, 6 1/4s, 3/1/15   B-/P   500,000   525,415  
NY City, Indl. Dev. Agcy. Special Fac. Rev. Bonds        
(British Airways PLC), 5 1/4s, 12/1/32   BB+   250,000   244,500  
NY State Dorm. Auth. Rev. Bonds        
(State U. Edl. Fac.), Ser. A, 5 7/8s, 5/15/17   AA-   5,905,000   6,696,447  
(New York Methodist Hosp.), 5 1/4s, 7/1/11   Baa2   1,140,000   1,171,954  
NY State Energy Research & Dev. Auth. Gas Fac. Rev.        
Bonds (Brooklyn Union Gas), 6.952s, 7/1/26   A+   2,000,000   2,043,780  
Onondaga Cnty., Indl. Dev. Agcy. Rev. Bonds (Solvay        
Paperboard, LLC), 7s, 11/1/30 (acquired 6/30/04, cost        
$1,141,503) (RES)   BB/P   1,100,000   1,138,269  
Port. Auth. NY & NJ Special Oblig. Rev. Bonds (JFK        
Intl. Air Term. - 6), MBIA, 5.9s, 12/1/17   Aaa   2,250,000   2,309,018  
Suffolk Cnty., Indl. Dev. Agcy. Cont. Care Retirement        
Rev. Bonds (Peconic Landing), Ser. A, 8s, 10/1/30   BB-/P   650,000   702,709  
      20,272,668  

 
North Carolina (6.2%)        
NC Eastern Muni. Pwr. Agcy. Syst. Rev. Bonds        
Ser. A, 5 3/4s, 1/1/26   Baa2   2,000,000   2,074,920  
Ser. B, 5.65s, 1/1/16   Baa2   1,000,000   1,039,890  
NC Med. Care Cmnty. Hlth. Care Fac. Rev. Bonds (First        
Mtge. - Presbyterian Homes), 5 3/8s, 10/1/22   BB/P   500,000   506,275  
NC State Muni. Pwr. Agcy. Rev. Bonds (No. 1, Catawba        
Elec.)        
Ser. B, 6 1/2s, 1/1/20   A3   3,000,000   3,191,490  
Ser. A, MBIA, 5 1/4s, 1/1/19   Aaa   5,400,000   5,687,712  
      12,500,287  

 
North Dakota (1.5%)        
Grand Forks, Hlth. Care Syst. Rev. Bonds (Altru Hlth.        
Syst. Oblig. Group), 7 1/8s, 8/15/24   Baa2   2,000,000   2,154,120  
ND State Board of Higher Ed. Rev. Bonds (U. of ND Hsg.        
& Auxillary Fac.), FSA, 5s, 4/1/21   Aaa   935,000   977,730  
      3,131,850  

 
Ohio (1.7%)        
Coshocton Cnty., Env. 144A Rev. Bonds (Smurfit-Stone        
Container Corp.), 5 1/8s, 8/1/13   CCC+   600,000   595,878  
OH State Higher Ed. Fac. Comm. Rev. Bonds (John        
Carroll U.), 5 1/4s, 11/15/33   A2   500,000   522,240  
Rickenbacker, Port Auth. Rev. Bonds (OASBO Expanded        
Asset Pooled), Ser. A, 5 3/8s, 1/1/32   A2   2,170,000   2,331,882  
      3,450,000  

 
Oklahoma (3.6%)        
Durant, Cmnty. Facs. Auth. G.O. Bonds, XLCA, 5 3/4s,        
11/1/24   Aaa   1,730,000   1,903,813  
OK Dev. Fin. Auth. Rev. Bonds (Hillcrest Hlth. Care        
Syst.), Ser. A, U.S. Govt. Coll., 5 5/8s, 8/15/29        
(Prerefunded)   Aaa   1,075,000   1,124,063  
OK Hsg. Fin. Agcy. Single Fam. Rev. Bonds        
(Homeownership Loan), Ser. C-2, GNMA Coll., FNMA        
Coll., 5.7s, 9/1/35   Aaa   285,000   296,243  
OK State Cap. Impt. State Facs. Auth. VRDN (Higher        
Ed.), Ser. D-2, CIFG, 3.74s, 7/1/32   VMIG1   3,900,000   3,900,000  
      7,224,119  

 
Oregon (0.6%)        
Multnomah Cnty., Hosp. Fac. Auth. Rev. Bonds        
(Terwilliger Plaza), Ser. A, 5 1/4s, 12/1/26   BB-/P   520,000   515,720  
OR State Hsg. & Cmnty. Svcs. Dept. Rev. Bonds (Single        
Family Mtge.), Ser. K, 5 5/8s, 7/1/29   Aa2   680,000   691,261  
      1,206,981  

 
Pennsylvania (11.6%)        
Bucks Cnty., Indl. Dev. Auth. Rev. Bonds (USX Corp.),        
5.6s, 3/1/33   Baa1   2,025,000   2,080,242  
Bucks Cnty., Indl. Dev. Auth. Retirement Cmnty. Rev.        
Bonds (Ann's Choice, Inc.), Ser. A, 5.4s, 1/1/15   BB/P   530,000   536,842  
Carbon Cnty., Indl. Dev. Auth. Rev. Bonds (Panther        
Creek Partners), 6.65s, 5/1/10   BBB-   580,000   594,349  
Dauphin Cnty., Hosp. Auth. Rev. Bonds (Hapsco-Western        
PA Hosp.), Ser. A, MBIA, 6 1/2s, 7/1/12   Aaa   5,000,000   5,006,000  
Lancaster Cnty., Hosp. Auth. Rev. Bonds (Gen. Hosp.),        
5 1/2s, 3/15/26 (Prerefunded)   AA-   1,500,000   1,630,275  
Lehigh Cnty., Gen. Purpose Auth. Rev. Bonds (Lehigh        


     
Valley Hosp. Hlth. Network), Ser. A, 5 1/4s, 7/1/32   A1   1,000,000   1,013,510  
PA State Econ. Dev. Fin. Auth. Resource Recvy. Rev.        
Bonds (Northampton Generating), Ser. A        
6.6s, 1/1/19   B+   400,000   402,080  
6 1/2s, 1/1/13   B+   1,000,000   1,004,690  
PA State Higher Edl. Fac. Auth. Rev. Bonds        
(Widener U.), 5 3/8s, 7/15/29   BBB+   750,000   776,385  
(Philadelphia U.), 5s, 6/1/30   Baa2   780,000   782,956  
(Philadelphia U.), 5s, 6/1/22   Baa2   300,000   303,465  
Philadelphia, Gas Wks. Rev. Bonds, Ser. A-1, FSA, 5s,        
9/1/25   Aaa   2,505,000   2,589,318  
Philadelphia, Hosp. & Higher Ed. Fac. Auth. Rev. Bonds        
(Hosp.-Graduate Hlth. Sys.), Ser. A, 6 1/4s, 7/1/13        
(In default) (NON)   D/P   1,466,136   2,932  
(Children's Hosp. of Philadelphia), Ser. A, 4 1/2s,        
7/1/33   Aa2   1,000,000   937,430  
Sayre, Hlth. Care Fac. Auth. Rev. Bonds (Guthrie        
Hlth.), Ser. A        
5 7/8s, 12/1/31 (Prerefunded)   A   850,000   924,460  
5 7/8s, 12/1/31   A   250,000   263,610  
Scranton, G.O. Bonds, Ser. C, 7.1s, 9/1/31        
(Prerefunded)   AAA/P   3,000,000   3,362,190  
West Cornwall, Tpk. Muni. Auth. Rev. Bonds        
(Elizabethtown College), 6s, 12/15/27 (Prerefunded)   BBB+   1,000,000   1,084,770  
      23,295,504  

 
Puerto Rico (1.7%)        
Cmnwlth. of PR, Govt. Dev. Bank Rev. Bonds, Ser. AA,        
5s, 12/1/16   Baa3   250,000   262,728  
Cmnwlth. of PR, Hwy. & Trans. Auth. Rev. Bonds, Ser.        
B, 6s, 7/1/39 (Prerefunded)   BBB+   3,000,000   3,209,610  
      3,472,338  

 
South Carolina (4.3%)        
Lexington Cnty., Hlth. Svcs. Dist. Hosp. Rev. Bonds,        
5s, 11/1/23   A+   1,340,000   1,351,671  
SC Hosp. Auth. Rev. Bonds (Med. U.), Ser. A, 6 1/2s,        
8/15/32 (Prerefunded)   AAA   1,000,000   1,119,220  
SC Jobs Econ. Dev. Auth. Hosp. Fac. Rev. Bonds        
(Palmetto Hlth. Alliance), Ser. A, 7 3/8s, 12/15/21        
(Prerefunded)   BBB+/F   700,000   788,536  
(Palmetto Hlth.), Ser. C, 6s, 8/1/20 (Prerefunded)   Baa1   1,335,000   1,475,309  
(Palmetto Hlth.), Ser. C, 6s, 8/1/20 (Prerefunded)   Baa1   165,000   182,342  
SC Tobacco Settlement Rev. Mgmt. Auth. Rev. Bonds,        
Ser. B, 6 3/8s, 5/15/30   BBB   2,000,000   2,236,720  
SC Tobacco Settlement Rev. Mgmt. Auth. Rev. Bonds,        
Ser. B, 6 3/8s, 5/15/28   BBB   1,500,000   1,584,720  
      8,738,518  

 
South Dakota (0.4%)        
SD State Hlth. & Edl. Fac. Auth. Rev. Bonds (Sanford        
Hlth.)        
5s, 11/1/21   AA-   250,000   255,988  
5s, 11/1/20   AA-   500,000   513,945  
      769,933  

 
Tennessee (2.2%)        
Johnson City, Hlth. & Edl. Fac. Board Hosp. Rev. Bonds        
(First Mtge. Mountain States Hlth.), Ser. A, 7 1/2s,        
7/1/33   Baa1   2,425,000   2,769,399  
Shelby Cnty., Hlth. Edl. & Hsg. Fac. Hosp. Board Rev.        
Bonds (Methodist Hlth. Care)        
6 1/2s, 9/1/26 (Prerefunded)   AAA   630,000   704,157  
6 1/2s, 9/1/26 (Prerefunded)   AAA   370,000   413,553  
Sullivan Cnty., Hlth. Edl. & Hsg. Hosp. Fac. Board        
Rev. Bonds (Wellmont Hlth. Syst.), Ser. C, 5s, 9/1/22   BBB+   480,000   477,970  
      4,365,079  

 
Texas (16.2%)        
Alliance, Arpt. Auth. Rev. Bonds (Federal Express        
Corp.), 4.85s, 4/1/21   Baa2   1,500,000   1,480,740  
Brazoria Cnty., Brazos River Harbor Naval Dist. VRDN        
(Dow Chemical Co.), Ser. A-3, 5 1/8s, 5/15/33   A3   170,000   168,188  
Coppell, Indpt. School Dist. G.O. Bonds, PSFG, zero %,        
8/15/21   Aaa   2,870,000   1,509,792  
Dallas-Fort Worth, Intl. Arpt. Fac. Impt. Corp. Rev.        
Bonds, Ser. A, FGIC, 5 3/4s, 11/1/13   Aaa   5,000,000   5,318,050  
Frisco Indpt. School Dist. G.O. Bonds (School Bldg.),        
Ser. B, MBIA, 5s, 7/15/28   Aaa   2,515,000   2,589,268  
Galena Pk., Indpt. School Dist. G.O. Bonds, PSFG, zero        
%, 8/15/28   Aaa   5,270,000   1,943,260  
Gulf Coast, Waste Disp. Auth. Rev. Bonds (Valero        
Energy Corp.), 6.65s, 4/1/32   BBB   1,000,000   1,062,840  
Humble, Indpt. School Dist. G.O. Bonds (School Bldg.),        
Ser. A, FSA, 4 3/4s, 2/15/30   Aaa   1,900,000   1,902,850  
New Caney, Indpt. School Dist. G.O. Bonds, FGIC, 5s,        
2/15/29   Aaa   2,405,000   2,473,855  
Sam Rayburn Muni. Pwr. Agcy. Rev. Bonds, 6s, 10/1/21   Baa2   1,500,000   1,567,380  
San Antonio, Muni. Drain Util. Syst. Rev. Bonds, MBIA,        


     
5 1/4s, 2/1/23   Aaa   2,945,000   3,116,811  
TX State Dept. of Hsg. & Cmnty. Affairs Rev. Bonds        
(Single Fam.), Ser. F, FHA Insd., 5 3/4s, 3/1/37   AAA   1,000,000   1,056,830  
TX State Tpk. Auth. Rev. Bonds (Central Texas Tpk.        
Syst.), Ser. A, AMBAC, 5 1/2s, 8/15/39   Aaa   8,000,000   8,482,160  
      32,672,024  

 
Utah (0.4%)        
UT Cnty., Env. Impt. Rev. Bonds (Marathon Oil), 5.05s,        
11/1/17   Baa1   675,000   700,191  

 
Vermont (0.1%)        
VT Hsg. Fin. Agcy. Rev. Bonds (Single Fam.), Ser. 23,        
FSA, 5s, 5/1/34   Aaa   260,000   264,399  

 
Virginia (1.9%)        
Prince William Cnty., Indl. Dev. Auth. Hosp. Rev.        
Bonds (Potomac Hosp. Corp.), 5.35s, 10/1/36   A3   500,000   519,040  
Richmond, Pub. Util. Rev. Bonds, FSA, 5s, 1/15/27   Aaa   2,000,000   2,084,500  
Stafford Cnty., Econ. Dev. Auth. Hosp. Fac. Rev. Bonds        
(Medicorp. Hlth. Syst.), 5 1/4s, 6/15/26   A3   1,250,000   1,292,900  
      3,896,440  

 
Washington (5.7%)        
Everett, Pub. Fac. Dist. Ltd. Sales Tax & Interlocal        
Rev. Bonds, Ser. A, 5s, 12/1/21   A   940,000   976,058  
Tobacco Settlement Auth. of WA Rev. Bonds        
6 5/8s, 6/1/32   BBB   900,000   966,960  
6 1/2s, 6/1/26   BBB   2,250,000   2,409,345  
WA State G.O. Bonds, Ser. E, MBIA        
5s, 1/1/28   Aaa   3,125,000   3,236,375  
5s, 1/1/27   Aaa   3,680,000   3,815,866  
      11,404,604  

 
West Virginia (1.3%)        
West Virginia U. Rev. Bonds, Ser. C, FGIC, 5s, 10/1/28   Aaa   2,530,000   2,623,812  

 
Wisconsin (3.9%)        
Badger Tobacco Settlement Asset Securitization Corp.        
Rev. Bonds, 6 3/8s, 6/1/32   BBB   2,600,000   2,815,098  
Badger Tobacco Settlement Asset Securitization Corp.        
Rev. Bonds, 7s, 6/1/28   BBB   2,600,000   2,842,476  
WI State Hlth. & Edl. Fac. Auth. Rev. Bonds        
(Wheaton Franciscan), 5 3/4s, 8/15/30 (Prerefunded)   A-   1,600,000   1,733,920  
(Ascension Hlth. Credit), Ser. A, 5s, 11/15/31   Aa2   560,000   565,757  
      7,957,251  
 
 
TOTAL INVESTMENTS        

Total investments (cost $326,228,394) (b)       $335,954,149  


FUTURES CONTRACTS OUTSTANDING at 7/31/07 (Unaudited)

         
  Number of     Expiration   Unrealized  
  contracts   Value   date   depreciation  

U.S. Treasury Note 5 yr (Short)   150   $15,820,313   Sep-07   $(251,069)  


NOTES

(a) Percentages indicated are based on net assets of $201,453,319 .

(RAT) The Moody's or Standard & Poor's ratings indicated are believed to be the most recent ratings available at July 31, 2007 for the securities listed. Ratings are generally ascribed to securities at the time of issuance. While the agencies may from time to time revise such ratings, they undertake no obligation to do so, and the ratings do not necessarily represent what the agencies would ascribe to these securities at July 31, 2007. Securities rated by Putnam are indicated by "/P." Securities rated by Fitch are indicated by "/F."

(NON) Non-income producing security.

(b) The aggregate identified cost on a tax basis is $326,238,873, resulting in gross unrealized appreciation and depreciation of $13,006,538 and $3,291,262, respectively, or net unrealized appreciation of $9,715,276.

(RES) Restricted, excluding 144A securities, as to public resale. The total market value of restricted securities held at July 31, 2007 was $1,138,269 or 0.6% of net assets.

(SEG) A portion of this security was pledged and segregated with the custodian to cover margin requirements for futures contracts at July 31, 2007.

144A after the name of an issuer represents securities exempt from registration under Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration, normally to qualified institutional buyers.

The rates shown on Variable Rate Demand Notes (VRDN) and Mandatory Put Bonds are the current interest rates at July 31, 2007.

The dates shown on Mandatory Put Bonds are the next mandatory put dates.

The dates shown on debt obligations other than Mandatory Put Bonds are the original maturity dates.

The fund had the following sector concentrations greater than 10% at July 31, 2007 (as a percentage of net assets):

Health care   45.8%  
Utilities   23.9  
Local Government   20.7  
State Government   14.9  
Transportation   11.3  
Air Transportation   10.1  

The fund had the following insurance concentrations greater than 10% at July 31, 2007 (as a percentage of net assets):

AMBAC   21.4%  
MBIA   17.6  
FGIC   14.7  
FSA   11.4  

Security valuation Tax-exempt bonds and notes are generally valued on the basis of valuations provided by an independent pricing service approved by the Trustees. Such services use information with respect to transactions in bonds, quotations from bond dealers, market transactions in comparable securities and various relationships between securities in determining value. Certain investments are also valued at fair value following procedures approved by the Trustees. Such valuations and procedures are reviewed periodically by the Trustees. The fair value of securities is generally determined as the amount that the fund could reasonably expect to realize from an orderly disposition of such securities over a reasonable period of time. By its nature, a fair value price is a good faith estimate of the value of a security at a given point in time and does not reflect an actual market price, which may be different by a material amount.

Futures and options contracts The fund may use futures and options contracts to hedge against changes in the values of securities the fund owns or expects to purchase, or for other investment purposes. The fund may also write options on swaps or securities it owns or in which it may invest to increase its current returns.

The potential risk to the fund is that the change in value of futures and options contracts may not correspond to the change in value of the hedged instruments. In addition, losses may arise from changes in the value of the underlying instruments, if there is an illiquid secondary market for the contracts, or if the counterparty to the contract is unable to perform. Risks may exceed amounts recognized on the statement of assets and liabilities. When the contract is closed, the fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Realized gains and losses on purchased options are included in realized gains and losses on investment securities. If a written call option is exercised, the premium originally received is recorded as an addition to sales proceeds. If a written put option is exercised, the premium originally received is recorded as a reduction to the cost of investments.

Futures contracts are valued at the quoted daily settlement prices established by the exchange on which they trade. The fund and the broker agree to exchange an amount of cash equal to the daily fluctuation in the value of the futures contract. Such receipts or payments are known as “variation margin.” Exchange traded options are valued at the last sale price or, if no sales are reported, the last bid price for purchased options and the last ask price for written options. Options traded over-the-counter are valued using prices supplied by dealers. Futures and written option contracts outstanding at period end, if any, are listed after the fund’s portfolio.

For additional information regarding the fund please see the fund's most recent annual or semiannual shareholder report filed on the Securities and Exchange Commission's Web site, www.sec.gov, or visit Putnam's Individual Investor Web site at www.putnaminvestments.com


Item 2. Controls and Procedures:

(a) The registrant's principal executive officer and principal financial officer have concluded, based on their evaluation of the effectiveness of the design and operation of the registrant's disclosure controls and procedures as of a date within 90 days of the filing date of this report, that the design and operation of such procedures are generally effective to provide reasonable assurance that information required to be disclosed by the registrant in this report is recorded, processed, summarized and reported within the time periods specified in the Commission's rules and forms.

(b) Changes in internal control over financial reporting:
Not applicable

Item 3. Exhibits:

Separate certifications for the principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Investment Company Act of 1940, as amended, are filed herewith.

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.

Putnam Municipal Bond Fund

By (Signature and Title):

/s/ Janet C. Smith
Janet C. Smith
Principal Accounting Officer
Date: September 28, 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 (Signature and Title):

/s/ Charles E. Porter
Charles E. Porter
Principal Executive Officer
Date: September 28, 2007

By (Signature and Title):

/s/ Steven D. Krichmar
Steven D. Krichmar
Principal Financial Officer
Date: September 28, 2007


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