PROSPECTUS SUPPLEMENT File No. 333-68747
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(To Prospectus and Prospectus Supplement dated June 16, 2000
and June 15, 2000, respectively) Rule 424(b)(3)
Prospectus number: 1983
Merrill Lynch & Co., Inc.
Medium Term Notes, Series B
Due Nine Months or More from Date of Issue
Fixed Rate Notes
Principal Amount: $25,000,000
CUSIP Number: 59018S7K4
Interest Rate: 7.06000%
Original Issue Date: June 21, 2000
Stated Maturity Date: June 21, 2001
Interest Payment Dates: At Maturity
0
Repayment at the Option
of the Holder: The Notes cannot be repaid prior to the Stated
Maturity Date.
Redemption at the Option
of the Company: The Notes cannot be redeemed prior to the Stated
Maturity Date.
Form: The Notes are being issued in fully registered
book-entry form.
Trustee: The Chase Manhattan Bank
Dated: June 19, 2000
