David W. Braswell Direct T 314.552.6631 F 314.612.2229 dbraswell@armstrongteasdale.com     MISSOURI KANSAS ILLINOIS NEVADA SHANGHAI

January 24, 2013

Correspondence Filing via EDGAR

Ms. Mara L. Ransom

Assistant Director

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Re: Cass Information Systems, Inc. Annual Report on Form 10-K for fiscal year ended December 31, 2011 Filed March 9, 2012 Definitive Proxy on Schedule 14A Filed March 16, 2012 Response dated January 4, 2013 File No. 000-20827

Dear Ms. Ransom:

On behalf of Cass Information Systems, Inc. (the “Company”), we have requested an extension to the Company’s response to your letter dated January 9, 2013, which was originally due on January 24, 2013. The Company’s request has been granted. As such, the Company confirms that it will file the required response within 10 business days of the extension request date, or no later than February 6, 2013.

Sincerely,

/s/ David W. Braswell

David W. Braswell

cc: Scott Stringer/U.S. Securities and Exchange Commission Jason Niethamer/U.S. Securities and Exchange Commission Jacqueline Kaufman/U.S. Securities and Exchange Commission

ARMSTRONG TEASDALE LLP | 7700 FORSYTH BLVD., SUITE 1800, ST. LOUIS, MO 63105 T 314.621.5070 F 314.621.5065 ArmstrongTeasdale.com

January 24, 2013

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Dietrich King/U.S. Securities and Exchange Commission

Eric H. Brunngraber/Cass Information Systems, Inc.

P. Stephen Appelbaum, Cass Information Systems, Inc.

ARMSTRONG TEASDALE LLP