FIRST INTERSTATE BANCSYSTEM, INC.
401 North 31st Street
Billings, Montana 59116
September 29, 2017
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Re: First Interstate BancSystem, Inc.
Registration Statement on Form S-3
Registration No. 333-220594
Ladies and Gentlemen:
In accordance with Rule 461 of the General Rules and Regulations under the Securities Act of 1933, as amended, a request is made hereby on behalf of First Interstate BancSystem, Inc. that acceleration of the effectiveness of the above-captioned Registration Statement be granted for 4:00 p.m. Eastern Time on October 3, 2017, or as soon thereafter as practicable.
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| Very truly yours, |
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| FIRST INTERSTATE BANCSYSTEM, INC. |
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| By: | /s/ KIRK D. JENSEN |
| | Kirk D. Jensen |
| | Executive Vice President and General Counsel |