FILE NO. 333-28537
                                                                  RULE 424(B)(3)
 
 
 
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PROSPECTUS SUPPLEMENT NO. 1549               MARKET-MAKING TRANSACTIONS
(TO (I) PROSPECTUS DATED JULY 7, 1997 AND
(II) PROSPECTUS DATED JULY 7, 1997, AS
SUPPLEMENTED BY PROSPECTUS SUPPLEMENT DATED
JULY 7, 1997)
 
 
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                           MERRILL LYNCH & CO., INC.
                    MEDIUM-TERM NOTES (NO SERIES DESIGNATED)
                          MEDIUM-TERM NOTES (SERIES B)
 
     This Prospectus is used by Merrill Lynch, Pierce, Fenner & Smith
Incorporated ("MLPF&S"), a wholly-owned subsidiary of Merrill Lynch & Co., Inc.
("ML & Co."), in connection with offers and sales related to market-making
transactions in the Medium-Term Notes (no series designated) and Medium-Term
Notes (Series B) of ML & Co., Inc. which transactions MLPF&S acts as a
principal. Such sales will be made at prices related to prevailing market prices
at the time of sale.
     As of June 27, 1997, Medium-Term Notes (no series designated) and
Medium-Term Notes (Series B) of the Company have been issued and are currently
outstanding as follows:
 
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    From 9 Months but less than 12 Months             N/A
 
 
    From 12 Months but less than 18 Months      5.64% to 6.25%
 
 
    From 18 Months but less than 2 Years              N/A
 
 
    From 2 Years but less than 3 Years          6.01% to 6.77%
 
 
    From 3 Years but less than 4 Years          6.14% to 7.78%
 
 
    From 4 Years but less than 5 Years                N/A
 
 
    From 5 Years but less than 6 Years          6.06% to 6.96%
 
 
    From 6 Years but less than 7 Years                N/A
 
 
    From 7 Years but less than 10 Years         7.02% to 7.02%
 
 
    10 Years or more                            6.5% to 8.125%
 
 
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     MLPF&S may also act as an agent for its customers in connection with other
secondary market transactions in the Medium-Term Notes (no series designated)
and Medium-Term Notes (Series B).
 
*   This reflects actual interest rates for fixed rate Medium-Term Notes (no
   series designated) and Medium-Term Notes (Series B). In addition, the Company
   has outstanding a variety of floating rate Medium-Term Notes (no series
   designated) and Medium-Term Notes (Series B), the interest rates of which are
   reset periodically depending on various indices.
 
 
Dated: July 28, 1997