SLM Corporation
Medium Term Notes, Series B

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With Maturities of 9 Months or More from Date of Issue

Registration No. 333-90316    
Filed Pursuant to Rule 424(b)(3)    
Pricing Supplement No. 25   Trade Date: 3/10/03
(To Prospectus dated January 23, 2003 and Prospectus Supplement dated January 23, 2003)   Issue Date: 3/13/03

The date of this Pricing Supplement is 3/10/03
 
    
    
    
    
   Interest Payment
    
   Subject to Redemption
    
    
    
 
   Stated
Interest
Rate Per
Annum1
    
    
    
    
    
    
    
CUSIP
   Maturity
Date
   Price to
Public2, 3
   Discounts &
Commissions
   Frequency
   First
Payment
   Survivor's
Option
   Yes/No
   Date and
terms of
redemption
   Aggregate
Principal
Amount
   Net
Proceeds
   OID
Status
78490FBA6   4.400%   8/15/12   100%   1.250%   Semi   08/15/03   Yes   No       1,976,000   1,951,300.00   N
1
The interest rates on the Ed Notes may be changed by SLM Corporation from time to time, but any such change will not affect the interest rate on any Ed Notes offered prior to the effective date of the change.
2
Expressed as a percentage of aggregate principal amount.
3
See "Supplemental Plan of Distribution" in the Prospectus supplement for additional information concerning price to public and underwriting compensation.