extensionltr.htm

July 30, 2010

Brigitte Lippmann, Esq.

Special Counsel

U.S. Securities and Exchange Commission

Division of Corporation Finance

Washington, D.C. 20549-3561

Re:	CarMax, Inc.

Form 10-K for Fiscal Year Ended February 28, 2010

Filed April 27, 2010

Definitive Proxy Statement on Schedule 14A

Filed May 3, 2010

File No. 001-31420

Dear Ms. Lippmann:

As a follow-up to the conversation we had yesterday, this letter will confirm that CarMax, Inc. has requested an extension until August 24, 2010 to respond to the comment letter that we received regarding the above-referenced filed documents. If you have any questions or comments, please do not hesitate to contact me at (804) 935-4526.

Sincerely,

/s/ John M. Stuckey, III

John M. (“Mac”) Stuckey, III

Associate General Counsel and

Assistant Secretary