PUTNAM AMERICAN GOVERNMENT INCOME FUND
N-30D, 1994-06-02
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(logo)

Putnam
American
Government
Income Fund

Semiannual
Report
March 31, 1994

(artwork)

For investors seeking 
high current income
primarily through
U.S. government
securities

A member
of the Putnam
Family of Funds

     Contents
 2   How your fund performed
 3   From the Chairman
 4   Report from Putnam Management
     Semiannual Report
 7   Portfolio of investments owned
 9   Financial statements
19   Fund performance supplement
<PAGE>
How your
fund performed

For periods ended March 31, 1994

Total return*                           Lehman Bros.    Consumer
             Fund                       Intermediate       Price
      NAV           POP               Treasury Index       Index
6 months         -3.67%     -8.26%            -1.72%       1.45%
1 year             0.07      -4.68              2.35        2.51
5 years           44.26      37.44             58.19       20.36
  annualized       7.60       6.57              9.61        3.78
Life-of-fund                                                    
(since 3/1/85)   103.12      93.42            133.63       38.87
  annualized       8.12       7.54              9.79        3.68

Share data                        
                               NAV               POP
September 30, 1993                             $9.21       $9.67
March 31, 1994                                 $8.55       $8.98

Distributions                             Investment
6 months ended              Number            income       Total
March 31, 1994                   6            $0.331      $0.331

Current returns                   
at the end of the period                         NAV         POP
Current dividend rate                          7.16%       6.82%
Current 30-day yield                            5.10        4.86


*Performance data represent past results. Investment return and
net asset value will fluctuate so an investor's shares, when
redeemed, may be worth more or less than their original cost.
Performance data reflect fund operations under the investment
objective and strategies and the distribution policy in effect
prior to November 1, 1992.
<PAGE>
Terms you need to know

Total return is the change in value of an investment from the
beginning to the end of a period, assuming the reinvestment of
all distributions. It may be shown at net asset value or at
public offering price.

Net asset value (NAV) is the value of all your fund's assets,
minus any liabilities, divided by the number of outstanding
shares, not reflecting any sales charge. 

Public offering price (POP) is the price of a mutual fund share
plus the maximum 4.75% sales charge levied at the time of
purchase. 

Current dividend rate is calculated by annualizing the net
investment income paid to shareholders in the fund's most recent
distribution, then dividing by the NAV or POP on the last day of
the period.

Current 30-day yield, based only on the fund's net investment
income, is calculated in accordance with Securities and Exchange
Commission guidelines.

Please see the fund performance supplement on page 19 for
additional information about performance comparisons.
<PAGE>
From the
Chairman

(photograph of George Putnam)
(c) Karsh, Ottawa

George Putnam
Chairman
of the Trustees

Dear Shareholder:

The period in which we now write is a challenging one. A series
of bond- and stock-market corrections has exacerbated market
volatility and sparked investor concerns. 

Despite initially gloomy headlines, we believe economic
fundamentals remain sound. At this stage of the recovery, with
interest rates having edged upward for the first time in several
years, market volatility is a natural occurrence. The performance
of Putnam American Government Income Fund should be expected to
reflect the environment in which it invests. The fund is an
intermediate- to long-term investment, and, unlike short-term
investments such as money market funds, it is likely to have
periodic fluctuations of principal.

On a brighter note, I am pleased to inform you of a change in the
management of your fund. Michael Martino started managing the
day-to-day operations of the fund in March but is no newcomer to
the investment business. Mike brings to Putnam considerable
talent and over 18 years of investment experience, having managed
portfolios for the New England Mutual Life Insurance Company and
Back Bay Advisors. We are delighted to welcome him to our
management team.

In these uncertain times, professional management is more
important than ever. As you review your investment program in
light of current events, we hope you will proceed cautiously. A
well-reasoned investment strategy, fashioned to meet your
long-term needs, should not be altered without careful thought.
We believe that the advent of calmer markets and the portfolio
changes discussed in the following Report from Putnam Management
will contribute toward competitive returns for your fund.

Respectfully yours,

George Putnam
May 18, 1994
<PAGE>
Report from
Putnam Management

In early February, after more than five years of declining
interest rates, the Federal Reserve Board raised short-term
interest rates by a quarter of a percentage point, then raised
them another quarter point in March. Each increase had a
disastrous effect on the bond markets, culminating in a complete
reversal of bond-investor psychology to one of widespread
pessimism. The 10-year Treasury ended the first quarter of 1994
with a return of -5.79% and a yield of 6.78% -- the highest since
November 1992. 

Putnam American Government Income Fund's performance during this
period was average for its peer group; its shares posted a total
return of -3.67% at NAV for the six months ended March 31, 1994.
The average U.S. government fund as reported by Lipper Analytical
Services, Inc., an independent research firm, returned -3.56%.
Your fund's performance, while negative, is still competitive and
must be taken in the context of a wide-scale bond market decline.
For additional performance information, please see the table on
page 2. 

Investors overreact, bonds oversold Given the size and breadth of
the first-quarter correction, a few words of explanation are
appropriate. It is our view that the market's sell-off was an
overreaction to and possibly a misinterpretation of the Fed's
actions. It is important to remember that, up until the end of
1993, interest rates had been declining for years, with the
Federal Reserve making accommodative cuts along the way. More
encouraging still, the economic recovery seemed to be progressing
slowly enough that inflation need not be a concern. Inflation, of
course, is the bond market's primary worry, since it erodes the
income earned from fixed-income investments.

All this changed abruptly in the first quarter of 1994. First,
when reports detailing unusually strong economic growth started
surfacing in early January, bond traders and analysts on Wall
Street began to get nervous. Then, when the Fed raised short-term
rates in February, shareholders and money managers alike
interpreted it as an effort to stem existing inflation --
inflation they had not detected. They had been caught off guard. 

An outburst of selling erupted on two fronts. First,
shareholders, particularly those invested in no-load mutual
funds, cashed in their shares. Fund managers met these
redemptions by selling securities. Second, multibillion-dollar
hedge funds, which manage large private-investor accounts by
using a host of complex derivative securities, began to unload
bundles of these securities, particularly principal-only CMOs
(collateralized mortgage obligations). And, at this point, the
markets did not want them. The result was further price declines
amid aggravated selling --  some hedge funds lost hundreds of
millions of dollars. <PAGE>
Gearing up for change Late in 1993, we began to conclude that
interest rates had hit rock bottom. If you remember, short-term
rates, minus inflation, were practically zero. While it was not
possible to predict when interest rates would pick up again, it
was obvious that, sooner or later, they would. Your fund's
relatively strong performance during the period was the result of
two deliberate moves on our part to prepare for the inevitable.
First, in early January, we reduced the fund's CMO position from
25% to 10% of the portfolio. As we've seen with hedge funds, some
derivative securities tend to be difficult to sell during periods
of rising rates. It is precisely when rates rise that most
investors retreat to shorter maturities and better-quality
holdings. The 10% CMO position we now hold is of the highest
quality -- AAA-rated by Standard & Poor's(r) -- and very liquid.

Our second anticipatory measure was to keep the fund's duration
relatively short -- just 6.1 years at the end of the period.
Duration is a mathematical measure of a bond's sensitivity to
changes in interest rates and, like maturity, is expressed in
years. In general, bonds with shorter durations will be affected
less adversely by rising interest rates. Currently, the fund is
managed to be approximately as volatile as a 7- to 10-year
Treasury security, while seeking to produce more income.

The bond market's silver lining As investment managers, we are
trained to find the good in every downturn, and we believe the
recent bond market correction offers a host of opportunities. One
significant result of the first-quarter correction is that
mortgage-backed securities were oversold relative to comparable
U.S. Treasuries. This had a lot to do with the fierce selling of
derivative and highly leveraged mortgage-backed securities. We
see a tremendous opportunity to add value to the portfolio with
higher quality mortgage-backed securities now selling at a
discount. We expect to increase the fund's position in these
bonds by 10% in the coming weeks, to a full 40% of the portfolio. 

In addition, we will seek to increase the fund's position in 5-
to 7-year U.S. Treasuries, which should remain relatively stable
in an environment of rising short-term rates, while still
outperforming shorter-term securities.

Moderation in the coming months While it is highly likely that
the Federal Reserve will continue raising rates in the coming
weeks and months, it is unlikely that these moves will continue
to create the level of volatility seen in the first quarter.
Calmer markets should eventually prevail because the element of
surprise has been removed, and investors are now expecting rising
rates. What's more, we believe that the surge of economic growth
in the fourth quarter of 1993 was an aberration that will be
replaced this year with more subdued growth rates in the 3%
range. This should go a long way toward keeping inflation under
control. 

An environment of steadily rising rates, while far from ideal, is
at least manageable. We believe that our combined strategy of an
increased mortgage weighting coupled with a shorter, more
conservative average duration is not only appropriate, but will
lead to continued competitive performance for the remainder of
fiscal year 1994. 
<PAGE>
Portfolio of
investments owned
March 31, 1994 (Unaudited)

U.S. Government and Agency Obligations (92.8%)(a)
Principal Amount                                          Value

            Federal National Mortgage 
              Association                                      
$156,253,707   6 1/2s, with various due dates 
              to February 15, 2024                 $145,169,460
            Federal National Mortgage 
              Association Interest 
              Only Strips(b)                                   
  44,734,285   8 1/2s, August 25, 2022               12,078,257
            Government National 
              Mortgage Association                             
  817,420   9s, with various due dates 
              to April 15, 2022                         867,232
  75,559,863   8s, with various due dates 
              to March 15, 2023                      76,492,038
  97,884,664   7 1/2s, with various due dates 
              to January 15, 2024                    96,202,271
  18,505,953   7s, with various due dates 
              to July 15, 2023                       17,644,270
 150,000,000   7s, TBA, August 14, 2024(c)          143,015,625
 234,870,054   6 1/2s, with various due dates 
              to February 15, 2024                  216,010,119
  61,063,218   6s, Midgets with 
              various due dates to 
              January 15, 2009                       57,533,001
  50,000,000   U.S. Treasury Bonds, 11 1/8s, 
              August 15, 2003                        64,828,125
 150,000,000   U.S. Treasury Bonds, 7 1/8s, 
              February 15, 2023                     148,218,750
 278,000,000   U.S. Treasury Bonds, 6 1/4s, 
              August 15, 2023                       248,896,875
 269,000,000   U.S. Treasury Notes, 13 1/8s, 
              May 15, 1994                          271,774,063
  49,800,000   U.S. Treasury Notes, 12 5/8s, 
              August 15, 1994                        51,340,688
  46,000,000   U.S. Treasury Notes, 11 5/8s, 
              November 15, 1994                      48,041,250
 115,000,000   U.S. Treasury Notes, 7 1/8s, 
              April 15, 1998                        122,439,063
  46,000,000   U.S. Treasury Notes, 5 7/8s, 
              February 15, 2004                      43,096,250
 125,500,000   U.S. Treasury Notes, 5 1/2, 
              February 28, 1999                     121,656,563
 330,000,000   U.S. Treasury Notes, 5 1/8s, 
              December 31, 1998                     315,356,250
 268,580,000   U.S. Treasury Notes, 5s, 
              January 31, 1999                      254,983,138
 86,000,000   U.S Treasury Stripped 
              Interest Payment Coupon 
              Securities zero %, 
              February 15, 2017                      15,721,875
 247,000,000   U.S Treasury Stripped 
              Interest Payment 
              Coupon Securities, zero %,
              November 15, 2016                      46,003,750
 272,500,000   U.S. Treasury Stripped 
              Interest Payment Coupon 
              Securities, zero %, 
              February 15, 2019                      43,344,531
 227,000,000   U.S. Treasury Stripped 
              Principal Payment 
              Coupon Securities, zero %, 
              November 15, 2018                      36,745,625

            Total U.S. Government and 
              Agency Obligations 
              (cost $2,754,250,525)              $2,597,459,069


Collateralized Mortgage Obligations (10.9%)(a)                 
Principal Amount                                          Value
            Federal Home Loan 
              Mortgage Corporation                             
$  37,475,500  10 1/2s, December 15, 2020     $     40,977,117 
  97,739,865   10s, January 15, 2021                104,850,134
2,181,266   Homestead Mortgage 
              Acceptance Corporation 
              11s, November 1, 2015                   2,258,974
            Federal National 
              Mortgage Association                             
  59,200,000   10 1/2s, November 25, 2006            64,990,500
7,500,000   10.2s, September 25, 2018                 8,006,250
  77,310,000   10s, with various due dates 
              to November 25, 2020                   83,689,456

            Total Collateralized 
              Mortgage Obligations 
              (cost $324,063,474)               $   304,772,431

Short-Term Investments (0.5%)(a) (cost $13,163,000)
Principal Amount                                          Value
$   13,163,000 Interest in $66,810,000 joint 
              repurchase agreement 
              dated March 31,1994 with 
              J.P. Morgan Securities, Inc. 
              due April 4, 1994 with 
              respect to various U.S. 
              Treasury obligations--
              maturity value of 
              $13,168,119 for an effective 
              yield of 3.5%                    $     13,163,000<PAGE>
            Total Investments 
              (cost $3,078,313,999)(d)           $2,915,394,500

Notes
(a) Percentages indicated are based on net assets of
$2,799,423,524, which correspond to a net asset value per share
of $8.55.

(b) Interest Only (IO) strips represent the right to receive the
monthly interest payments on an underlying pool of mortgage
loans. No payments of principal on the pool are passed through to
IO holders.

(c) TBAs are mortgage-backed securities traded under delayed
delivery commitments, settling after March 31, 1994. The unit
price for the trades has been finalized, the amount of the
commitments will not fluctuate more than 2% from the principal
amount. Income on the securities will not be earned until
settlement date. The cost of TBA purchases held at March 31,
1994, was $147,806,250 .

TBA Sale Commitments at March 31, 1994 
(Proceeds receivable $147,952,344)
                Principal    Delivery    Coupon          Market
Agency   Amount     Month        Rate     Value
FNMA         $155,000,000        Apr.    6 1/2%    $144,004,688

(d) The aggregate identified cost on a tax basis is
$3,083,242,590, resulting in gross unrealized appreciation and
depreciation of $4,826,264 and $172,674,354, respectively, or net
unrealized depreciation of $167,848,090.
<PAGE>
<TABLE>
<CAPTION>

Statement of
assets and liabilities
March 31, 1994 (Unaudited)
<S>      <C>                                                      <C>               <C>
Assets
         Investments in securities, at value (identified cost 
           $3,078,313,999) (Note 1)                                      $2,915,394,500
         Cash                                                                   163,252
         Interest receivable                                                 38,321,489
         Receivable for shares of the Fund sold                                 339,637
         Receivable for securities sold                                     222,326,296
             Total assets                                                 3,176,545,174

Liabilities
         Distributions payable to shareholders       $         20,810                  
         Payable for securities purchased                 215,726,741                  
         Payable for shares of the Fund repurchased        11,269,707                  
         Payable for compensation of Manager (Note 2)       3,628,158                  
         Payable for compensation of Trustees (Note 2)          3,556                  
         Payable for investor servicing and custodian fees (Note 2)             590,310     
         Payable for administrative services (Note 2)          16,405                  
         Payable for distribution fees (Note 2)             1,540,121                  
         Other accrued expenses                               321,154                  
         TBA sale commitment at value (proceeds receivable 
           $147,952,344) (Note 1)                         144,004,688                  
             Total liabilities                                              377,121,650

         Net assets                                                      $2,799,423,524

Represented by
         Paid-in capital (Notes 4 and 5)                                 $4,242,406,071
         Accumulated net realized loss on investments                   (1,298,974,991)
         Undistributed net investment income                                 14,964,287
         Net unrealized depreciation of investments and 
           TBA sale commitments                                           (158,971,843)
<PAGE>
         Total -- Representing net assets applicable to 
           capital shares outstanding                                    $2,799,423,524

Computation of net asset value and offering price
         Net asset value and redemption price per share
           ($2,799,423,524 divided by 327,605,020 shares)                         $8.55

         Offering price per share (100/95.25 of $8.55 )*                          $8.98


*On single retail sales of less than $50,000. On sales of $50,000 or more and on group
sales the offering price is reduced.

/TABLE
<PAGE>
<TABLE>
<CAPTION>

Statement of 
operations
Six months ended March 31, 1994 (Unaudited)

         <S>                                                      <C>               <C>
         Interest income                                                  $ 128,880,509

         Expenses:                                                                     
         Compensation of Manager (Note 2)                  $7,647,862                  
         Investor servicing and custodian fees (Note 2)       880,043                  
         Compensation of Trustees (Note 2)                     45,917                  
         Reports to shareholders                               84,087                  
         Auditing                                              46,541                  
         Legal                                                 21,747                  
         Postage                                              165,723                  
         Administrative services (Note 2)                      35,638                  
         Distribution fees (Note 2)                         3,459,419                  
         Other                                                129,535                  

             Total expenses                                                  12,516,512

         Net investment income                                              116,363,997

         Net realized loss on investments (Notes 1 and 3)                  (85,569,292)
         Net unrealized depreciation of investments and 
           TBA sale commitments during the period                         (145,364,897)

         Net loss on investment transactions                              (230,934,189)

         Net decrease in net assets resulting from operations            $(114,570,192)

/TABLE
<PAGE>
<TABLE>
<CAPTION>

Statement of
changes in net assets


                                                     Six months ended       Year ended 
                                                             March 31      September 30
                                                                1994*              1993
<S>      <C>                                                      <C>               <C>
Decrease in net assets
         Operations:                                                                   
         Net investment income                        $   116,363,997   $   321,023,280
         Net realized loss on investments                (85,569,292)      (45,992,616)
         Net unrealized depreciation of investments 
           and TBA sale commitments                     (145,364,897)      (12,761,363)

         Net increase (decrease) in net assets resulting 
           from operations                              (114,570,192)       262,269,301

         Undistributed net investment income included in 
           price of shares sold and repurchased, net               --         (156,161)
         Distributions to shareholders from:                                           
           net investment income                        (119,591,606)     (313,364,337)
         Decrease from capital share transactions (Note 4)                (496,544,886)(693,843,741)

         Total decrease in net assets                   (730,706,684)     (745,094,938)

Net assets
         Beginning of period                            3,530,130,208     4,275,225,146
         End of period (including undistributed net 
           investment income of $14,964,287 and $
           7,502,782, respectively)                    $2,799,423,524    $3,530,130,208

*Unaudited.

/TABLE
<PAGE>
<TABLE>
<CAPTION>

Financial highlights*
(For a share outstanding 
throughout the period)


                                 Six months ended                            Year ended
 March 31                                                September 30
  1994***                                    1993                1992
<S>   <C>                                     <C>                 <C>
Net Asset Value, 
  Beginning of Period                       $9.21               $9.32             $9.60

Investment Operations
Net Investment Income                         .32                 .77               .56
Net Realized and Unrealized 
  Gain (Loss) on Investments                (.65)               (.13)               .12

Total from 
  Investment Operations                     (.33)                 .64               .68

Less Distributions from:
Net Investment 
  Income (b)                                (.33)               (.75)             (.56)
Net Realized Gain 
  on Investments                               --                  --             (.40)
Paid-in Capital (b)                            --                  --                --

Total Distributions                         (.33)               (.75)             (.96)

Net Asset Value, 
  End of Period                             $8.55               $9.21             $9.32

Total Investment Return 
  at Net Asset Value (%) (c)             -7.34(d)                7.20              7.56
<PAGE>
Net Assets, 
  End of Period 
  (in thousands)                       $2,799,424          $3,530,130        $4,275,225

Ratio of Expenses to 
  Average Net Assets (%)                   .78(d)                 .91               .96
Ratio of Net Investment 
  Income to Average 
  Net Assets (%)                          7.28(d)                8.39              6.03
Portfolio Turnover (%)                  201.75(e)              235.61            798.43

See page 13 for notes to Financial highlights.

/TABLE
<PAGE>
<TABLE>
<CAPTION>

Financial highlights*(continued)

                                                                                                       For the period
                                                                                                        March 1, 1985
                                                                                                        (commencement
                                                                                                    of operations) to
                                                                 Year Ended September 30                 September 30
     1991                        1990           1989         1988        1987     1986     1985**
<S>   <C>                         <C>            <C>          <C>         <C>      <C>        <C>
Net Asset Value, 
  Beginning of Period           $9.32         $10.06       $10.30      $10.38   $12.41     $11.89              $11.57

Investment Operations
Net Investment Income             .70            .78          .84         .88      .91       1.05              .57(a)
Net Realized and Unrealized 
  Gain (Loss) on Investments      .59          (.32)          .12         .32   (1.36)       1.07                 .45

Total from 
  Investment Operations          1.29            .46          .96        1.20    (.45)       2.12                1.02

Less Distributions from:
Net Investment 
  Income (b)                    (.70)          (.78)        (.87)       (.92)   (1.02)     (1.17)               (.52)
Net Realized Gain 
  on Investments                (.31)             --           --          --    (.56)      (.43)               (.18)
Paid-in Capital (b)                --          (.42)        (.33)       (.36)       --         --                  --

Total Distributions            (1.01)         (1.20)       (1.20)      (1.28)   (1.58)     (1.60)               (.70)

Net Asset Value, 
  End of Period                 $9.60         $ 9.32       $10.06      $10.30   $10.38     $12.41              $11.89

Total Investment Return 
  at Net Asset Value (%) (c)    14.49           4.77        10.01       11.97   (4.46)      18.86            15.48(d)
<PAGE>
Net Assets, 
  End of Period 
  (in thousands)           $5,045,139     $6,171,106   $7,880,043 $9,519,718$10,558,552 $5,164,692           $824,625

Ratio of Expenses to 
  Average Net Assets (%)          .97            .95          .91        .75        .73        .82         1.05(a)(d)
Ratio of Net Investment 
  Income to Average 
  Net Assets (%)                 7.39           8.05         8.31       8.31       7.59       7.75         8.67(a)(d)
Portfolio Turnover (%)         469.45         255.47       213.35      52.18      98.74     187.37          171.09(e)


*Financial highlights for periods ended through September 30, 1992 have been restated to conform with requirements
issued by the SEC in April, 1993.
**Activity for the period from December 18, 1984 to February 28, 1985 is not included.
***Unaudited.
(a)Reflects a voluntary expense limitation in effect during the period. As a result of such limitation, expenses of the
Fund for the period ended September 30, 1985 reflect a reduction of less than $0.01 per share.
(b)See Note 1 to the Financial Statements. Additionally, $0.035, $0.044, and $0.11 of distributions from net investment
income for the years ended September 30, 1989, 1988, and 1987, respectively, represent return of capital for federal
income tax purposes.
(c)Total investment return assumes dividend reinvestment and does not reflect the effect of sales charges.
(d)Annualized.
(e)Not annualized.

/TABLE
<PAGE>
Notes to
financial statements
March 31, 1994 (Unaudited)

Note 1 Significant accounting policies

The Fund is registered under the Investment Company Act of 1940,
as amended, as a diversified, open-end management investment
company. The Fund seeks high current income with preservation of
capital as its secondary objective. Prior to November 1, 1992,
the Fund, was named Putnam High Income Government Trust, and had
the investment objective of high current return consistent with
preservation of capital through a portfolio of U.S. government
securities. 

The following is a summary of significant accounting policies
consistently followed by the Fund in the preparation of its
financial statements. The policies are in conformity with
generally accepted accounting principles.

A) Security valuation Investments for which market quotations are
readily available are stated at market value, which is determined
using the last reported sale price, or, if no sales are reported-
- -as in the case of most securities traded over-the-counter--the
last reported bid price, except that certain U.S. government
obligations are stated at the mean between the bid and asked
prices. Short-term investments having remaining maturities of 60
days or less are stated at amortized cost, which approximates
market value, and other investments are stated at fair value
following procedures approved by the Trustees.

B) TBA purchase commitments The Fund may enter into "TBA" (to be
announced) purchase commitments to purchase securities for a
fixed unit price at a future date beyond customary settlement
time. Although the unit price has been established, the principal
value has not been finalized. However, the amount of the
commitment will not fluctuate more than 2.0% from the principal
amount. The Fund holds, and maintains until the settlement date,
cash or high-grade debt obligations in an amount sufficient to
meet the purchase price, or the Fund enters into offsetting
contracts for the forward sale of other securities it owns. TBA
purchase commitments may be considered securities in themselves,
and involve a risk of loss if the value of the security to be
purchased declines prior to the settlement date, which risk is in
addition to the risk of decline in the value of the Fund's other
assets.

Unsettled TBA purchase commitments are valued at the current
market value of the underlying securities, generally according to
the procedures described under "Security valuation" above.

Although the Fund will generally enter into TBA purchase
commitments with the intention of acquiring securities for its
portfolio or for delivery pursuant to options contracts it has
entered into, the Fund may dispose of a commitment prior to
settlement if the Fund Manager deems it appropriate to do so.

TBA sale commitments The Fund may enter into TBA sale commitments
to hedge its portfolio positions or to sell mortgage-backed
securities it owns under delayed delivery arrangements. Proceeds
of TBA sale commitments are not received until the contractual
settlement date. During the time a TBA sale commitment is
outstanding, equivalent deliverable securities, or an offsetting
TBA purchase commitment deliverable on or before the sale
commitment date, are held as "cover" for the transaction.

Unsettled TBA sale commitments are valued at the current market
value of the underlying securities, generally according to the
procedures described under "Security valuation" above. The
contract is "marked-to-market" daily and the change in market
value is recorded by the Fund as an unrealized gain or loss. If
the TBA sale commitment is closed through the acquisition of an
offsetting purchase commitment, the Fund realizes a gain or loss
on the commitment without regard to any unrealized gain or loss
on the underlying security. If the Fund delivers securities under
the commitment, the Fund realizes a gain or loss from the sale of
the securities based upon the unit price established at the date
the commitment was entered into.

C) Joint trading account Pursuant to an exemptive order issued by
the Securities and Exchange Commission, the Fund may transfer
uninvested cash balances into a joint trading account, along with
the cash of other registered investment companies managed by
Putnam Investment Management Inc. (Putnam Management), the Fund's
Manager, a wholly-owned subsidiary of Putnam Investments, Inc.
and certain other accounts. These balances may be invested in one
or more repurchase agreements and/or short-term money market
instruments.

D) Repurchase agreements The Fund, or any joint trading account,
through its custodian, receives delivery of the underlying
securities, the market value of which at the time of purchase is
required to be in an amount at least equal to the resale price,
including accrued interest. The Fund's Manager is responsible for
determining that the value of these underlying securities is at
all times at least equal to the resale price, including accrued
interest.

E) Security transactions and related investment income Security
transactions are accounted for on the trade date (date the order
to buy or sell is executed). Interest income is recorded on the
accrual basis. Discount on zero coupon bonds is accreted
according to the effective yield method.

F) Federal taxes It is the policy of the Fund to distribute all
of its income within the prescribed time and otherwise comply
with the provisions of the Internal Revenue Code applicable to
regulated investment companies. It is also the intention of the
Fund to distribute an amount sufficient to avoid imposition of
any excise tax under Section 4982 of the Internal Revenue Code of
1986. Therefore, no provision has been made for federal taxes on
income, capital gains or unrealized appreciation of securities
held and excise tax on income and capital gains.

At September 30, 1993 the Fund had a capital loss carryover of
approximately $1,211,031,139 which may be available to offset
realized capital gains to the extent provided by regulations. Of
this amount, $1,165,356,319 and $45,674,820 will expire on
September 30, 1998 and 2001, respectively.

G) Distributions to shareholders Distributions to shareholders
are recorded by the Fund on the ex-dividend date.

H) Equalization Prior to October 1, 1993, the Fund used the
accounting practice known as equalization to keep a continuing
shareholder's per share interest in undistributed net investment
income unaffected by sales or repurchases of Fund shares. This
was accomplished by allocating a per share portion of the
proceeds from sales and the costs of repurchases of shares to
undistributed net investment income.

As of October 1, 1993, the Fund discontinued using equalization.
This change has no effect on the Fund's total net assets, net
asset value per share, or its net increase (decrease) in net
assets from operations and did not have a material effect on the
per share amounts shown in the financial highlights. In
management's opinion, discontinuation of the use of equalization
will result in less distortion of undistributed net investment
income as compared to income available for distribution for
federal income tax purposes. The cumulative effect of this
change, net of distributions, was to increase undistributed net
investment income and decrease to paid-in capital previously
reported through September 30, 1993 by $156,161.


Note 2 Management fee, administrative services, and other
transactions

Compensation of Putnam Management for management and investment
advisory services is paid quarterly based on the average net
assets of the Fund for the quarter.

Under a management contract dated December 8, 1989, the fees paid
by the Fund for management and investment advisory services are
based on the following rates: 0.60% of the first $500 million of
average net assets, 0.50% of the next $1 billion, 0.45% of the
next $1 billion, 0.40% of the next $4.5 billion, 0.375% of the
next $2.5 billion, and 0.35% of any amount over $9.5 billion,
subject, under current law, to reduction in any year to the
extent that expenses (exclusive of distribution fees, brokerage,
interest and taxes) of the Fund exceed 2.5% of the first $30
million of average net assets, 2% of the next $70 million and
1.5% of any amount over $100 million, and by the amount of
certain brokerage commissions and fees (less expenses) received
by affiliates of the Manager on the Fund's portfolio
transactions. These rates have been in effect since April 15,
1989 pursuant to the Stipulation of Settlement in Fountain, et
al. v. Putnam Management, et al., United States District Court,
District of Massachusetts ("the Stipulation"). The Stipulation
provides that, until April 15, 1994, the Fund's Manager will
continue to offer to provide services substantially similar to
those that it was obligated to provide prior to the Stipulation,
and that there will not be any increase in the rate of the Fund's
advisory fee except under certain circumstances specified in the
Stipulation.

The Fund also reimburses the Manager for the compensation and
related expenses of certain officers of the Fund and their staff
who provide administrative services to the Fund. The aggregate
amount of all such reimbursements is determined annually by the
Trustees. For the six months ended March 31, 1994 the Fund paid
$35,638 for these services.

The Fund has adopted a distribution plan (the "Plan") pursuant to
Rule 12b-1 under the Investment Company Act of 1940. The purpose
of the Plan is to compensate Putnam Mutual Funds Corp., a
wholly-owned subsidiary of Putnam Investments Inc., for services
provided and expenses incurred by it in distributing shares.
Under the Plan the Fund pays Putnam Mutual Funds Corp. at an
annual rate of 0.25% of the Fund's net assets at the end of each
quarter attributable to shareholders for whom firms other than
Putnam Mutual Funds are designated as the dealer of record. The
Stipulation discussed above provides that the rate of payments
made by the Fund pursuant to its Distribution Plan will not be
increased for a period of five years from the effective date of
the Stipulation, that is, until April 15, 1994, except under
certain circumstances specified in the Stipulation. For the six
months ended March 31, 1994, expenses under the Plan were
$3,459,419.

Trustees of the Fund receive an annual Trustee's fee of $4,990
and an additional fee for each Trustees' meeting attended.
Trustees who are not interested persons of the Manager and who
serve on committees of the Trustees receive additional fees for
attendance at certain committee meetings.

Custodial functions for the Fund's assets are provided by Putnam
Fiduciary Trust Company (PFTC), a subsidiary of Putnam
Investments, Inc. Investor servicing agent functions are provided
by Putnam Investor Services, a division of PFTC. Fees paid for
these investor servicing and custodial functions for the six
months ended March 31, 1994 amounted to $880,043.

Investor servicing and custodian fees reported in the Statement
of operations for the six months ended March 31, 1994 have been
reduced by credits allowed by PFTC.

During the six months ended March 31, 1994, Putnam Mutual Funds
Corp., acting as an underwriter, received net commissions of
$86,151 from the sale of shares of the Fund.

A deferred sales charge of up to 1% is assessed on certain
redemptions of shares purchased as part of an investment of $1
million or more. For the six months ended March 31, 1994 Putnam
Mutual Funds Corp., acting as an underwriter, received $208 on
such redemptions.


Note 3 Purchases and sales of securities

During the six months ended March 31, 1994, purchases and sales
of U.S. government obligations other than short-term investments
aggregated $6,629,156,330 and $6,910,715,438, respectively. In
determining the net gain or loss on securities sold, the cost of
securities has been determined on the identified cost basis.

<PAGE>
<TABLE>
<CAPTION>

Note 4 Capital shares

At March 31, 1994, there was an unlimited number of shares of beneficial interest
authorized. Transactions in capital shares were as follows:

                  Six months ended                          Year ended
                          March 31                        September 30
                      1994                              1993          
   Shares                   Amount            Shares            Amount
<S>   <C>                      <C>               <C>               <C>
Shares sold              5,216,517       $46,690,407        13,269,530     $121,899,393
Shares issued in connection 
  with reinvestment of 
  distributions          5,624,853        50,307,521        13,785,421      126,356,684

                        10,841,370        96,997,928        27,054,951      248,256,077
Shares repurchased    (66,483,654)     (593,542,814)     (102,699,591)    (942,099,818)

Net decrease          (55,642,284)    $(496,544,886)      (75,644,640)   $(693,843,741)

/TABLE
<PAGE>
Note 5 Reclassification of Capital Accounts

Effective October 1, 1993, Putnam American Government Income Fund
has adopted the provisions of Statement of Position 93-2
"Determination, Disclosure and Financial Statement Presentation
of Income, Capital Gain and Return of Capital Distributions, by
Investment Companies (SOP)." The purpose of this SOP is to report
the accumulated net investment income (loss) and accumulated net
realized gain (loss) accounts in such a manner as to approximate
amounts available for future distributions (or to offset future
realized capital gains) and to achieve uniformity in the
presentation of distributions by investment companies.

As a result of the SOP, the Fund has reclassified $10,532,953 to
increase undistributed net investment income, $392,203,864 to
increase accumulated net realized loss and $402,736,817 to
decrease additional paid in capital.

These adjustments represent the cumulative amounts necessary to
report these balances through September 30, 1993, the close of
the Fund's most recent fiscal year end for financial reporting
and tax purposes.


Note 6 Subsequent Events

On May 12, 1994, the Fund began issuing class B shares, which do
not pay a front-end sales charge, but pay a higher ongoing
distribution fee than the Fund's original class of shares (now
known as class A shares), and are subject to a contingent
deferred sales charge if redeemed within six years of purchase.

Effective May 6, the Fund has adopted a new Distribution Plan
pursuant to Rule 12b-1 under the Investment Company Act of 1940.
The purpose of the Plan is to compensate Putnam Mutual Funds
Corp., a wholly-owned subsidiary of Putnam Investments, Inc., for
services provided and expenses incurred by it in distributing
class A shares of the Fund. The Trustees have approved payment by
the Fund to Putnam Mutual Fund Corp. at the annual rate of 0.025%
of the Fund's average net assets attributable to class A shares.

<PAGE>
Fund 
performance 
supplement

Putnam American Government Income Fund is a portfolio managed for
high current income primarily through securities issued or
guaranteed by the U.S. government or its agencies or
instrumentalities. Preservation of capital is a secondary
objective. Although the U.S. government guarantees timely payment
of principal and interest on the underlying securities, the value
of fund shares is not guaranteed and will fluctuate.

The Lehman Brothers Intermediate Treasury Index is an unmanaged
list of Treasury bonds; it is used as a general gauge of the
market for Intermediate-term fixed-income securities. The index
does not take into account brokerage commissions or other costs.
Securities in the fund do not match those in the index and may
pose different risks.

The Consumer Price Index is a commonly used measure of inflation;
it does not represent an investment return. 

The fund performance supplement has been prepared by Putnam
Management to provide additional information about the fund and
the indexes used for performance comparisons. The information is
not part of the portfolio of investments owned nor the financial
statements.
<PAGE>
Putnam
American 
Government
Income Fund

Fund information

Investment manager
Putnam Investment 
Management, Inc.
One Post Office Square
Boston, MA 02109

Marketing services
Putnam Mutual Funds Corp.
One Post Office Square
Boston, MA 02109

Investor servicing agent
Putnam Investor Services
Mailing address:
P.O. Box 41203
Providence, RI 02940-1203
1-800-225-1581

Custodian
Putnam Fiduciary
Trust Company

Legal counsel
Ropes & Gray

(DALBAR logo)

Putnam Investor Services 
has received the DALBAR 
award each year since the 
award's 1990 inception.
In more than 10,000 tests
of 38 shareholder
service components,
Putnam outperformed
the industry standard
in every category.

A10-11902<PAGE>
Officers
George Putnam
President

Charles E. Porter
Executive Vice President

Patricia C. Flaherty
Senior Vice President

Lawrence J. Lasser
Vice President

Gordon H. Silver
Vice President

Gary N. Coburn
Vice President

Michael Martino
Vice President
and Fund Manager

William N. Shiebler
Vice President

John R. Verani
Vice President

John D. Hughes
Vice President
and Treasurer

Beverly Marcus
Clerk and 
Assistant Treasurer

Trustees
George Putnam, Chairman
William F. Pounds, Vice Chairman
Jameson Adkins Baxter, Hans H. Estin, 
John A. Hill, Elizabeth T. Kennan, 
Lawrence J. Lasser, Robert E. Patterson, 
Donald S. Perkins, George Putnam, III, 
A.J.C. Smith, W. Nicholas Thorndike

This report is for the information of 
shareholders of Putnam American 
Government Income Fund. It may 
also be used as sales literature when 
preceded or accompanied by the 
current prospectus, which gives details 
of sales charges, investment objectives, 
and operating policies of the fund.<PAGE>
- ------------------
Bulk Rate
U.S. Postage
Paid
Boston, MA
Permit No. 53749
- ------------------

PUTNAMINVESTMENTS
The Putnam Funds
One Post Office Square
Boston, Massachusetts  02109

<PAGE>
APPENDIX TO FORM N30D FILINGS TO DESCRIBE DIFFERENCES BETWEEN
PRINTED AND EDGAR-FILED TEXTS:


(1) Rule lines for tables are omitted.

(2) Boldface and italic typefaces are displayed in normal type.

(3) Headers (e.g, the name of the fund) and footers (e.g., page
numbers and "The accompanying notes are an integral part of these
financial statements") are omitted. 

(4) Because the printed page breaks are not reflected, certain
tabular and columnar headings and symbols are displayed
differently in this filing. 

(5) Bullet points and similar graphic signals are omitted.

(6) Page numbering is different.





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