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SEC Company Response from RiverNorth Managed Duration Municipal Income Fund, (RMM) — Dec 5, 2025

RiverNorth Managed Duration Municipal Income Fund, Inc.
Date: Dec. 5, 2025 · CIK: 0001771226 · Accession: 0001398344-25-022028

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File numbers found in text: 333-281390, 811-23434

Date
December 5, 2025
Author
/s/ David L. Williams
Form
CORRESP
Company
RiverNorth Managed Duration Municipal Income Fund, Inc.

Letter

VIA EDGAR TRANSMISSION 100 F Street, N.E. Washington, D.C. 20549 Attention: Melissa McDonough Re: RiverNorth Managed Duration Municipal Income Fund, Inc. (the "Fund" or the "Registrant") (File Nos. 333-281390; 811-23434); Response to Examiner Comments on N-CSR

Dear Ms. McDonough:

This letter responds to the staff's comment that you provided on November 20, 2025, in connection with your review of the Fund's above-referenced shareholder report ("Shareholder Report") on Form N-CSR. For your convenience, we have repeated the comment below in bold, and our response follows your comment. Capitalized terms not otherwise defined herein shall have the meaning ascribed to them in the Shareholder Report, unless otherwise indicated.

1. With respect to the significant returns of capital disclosed in the financial statements and in the 19(a) notices linked on the Fund's website, please consider modifying the tabular presentation of distribution information on the website to include monthly estimates of distributions comprising returns of capital to more clearly present the information to shareholders.

The Registrant will take this comment into consideration when updating the Fund's website.

We trust that the foregoing is responsive to your comments. Questions and comments concerning this filing may be directed to the undersigned at (312) 569-1107.

Sincerely,
/s/ David L. Williams

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CORRESP
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 filename1.htm

 Faegre Drinker Biddle & Reath LLP

 320 South Canal Street, Suite 3300

 Chicago, IL 60606

 (312) 569-1000 (Phone)

 (312) 569-3000 (Facsimile)

 www.faegredrinker.com

 December 5, 2025

 VIA EDGAR TRANSMISSION

 U.S. Securities and Exchange Commission

 100 F Street, N.E.

 Washington, D.C. 20549

 Attention: Melissa McDonough

 Re: RiverNorth Managed Duration Municipal
Income Fund, Inc. (the "Fund" or the "Registrant") (File Nos. 333-281390; 811-23434); Response to Examiner Comments
on N-CSR

 Dear Ms. McDonough:

 This letter responds to the staff's
comment that you provided on November 20, 2025, in connection with your review of the Fund's above-referenced shareholder report
("Shareholder Report") on Form N-CSR. For your convenience, we have repeated the comment below in bold, and our response follows
your comment. Capitalized terms not otherwise defined herein shall have the meaning ascribed to them in the Shareholder Report, unless
otherwise indicated.

 1.
 With respect to the significant returns of capital disclosed in the financial statements and in the 19(a) notices linked on the Fund's website, please consider modifying the tabular presentation of distribution information on the website to include monthly estimates of distributions comprising returns of capital to more clearly present the information to shareholders.

 The Registrant will take this comment into
consideration when updating the Fund's website.

 We trust that the foregoing is
responsive to your comments. Questions and comments concerning this filing may be directed to the undersigned at (312) 569-1107.

 Sincerely,

 /s/ David L. Williams

 David L. Williams