Western Asset Municipal Defined Opportunity Trust Inc., which is listed on the New York Stock Exchange under the symbol "MTT”, announced today monthly distributions of $0.0900per common share for December 2009 and January and February 2010. Additionally, the Fund announced a distribution from short-term capital gains of $0.0480 per common share for December 2009.

The distribution schedule appears below:

This press release is not for tax reporting purposes but is being provided to announce the amount of the Fund''s distributions that have been declared by the Board of Directors. In early 2010 and early 2011, after definitive information is available, the Fund will send shareholders a Form 1099-DIV, if applicable, specifying how the distributions paid by the Fund during the respective prior calendar year should be characterized for purposes of reporting the distributions on a shareholder''s tax return (e.g., ordinary income, long-term capital gain or return of capital).

Western Asset Municipal Defined Opportunity Trust Inc., a non-diversified, closed-end management investment company, is managed by Legg Mason Partners Fund Advisor, LLC, a wholly-owned subsidiary of Legg Mason, Inc., and is sub-advised by Western Asset Management Company, an affiliate of the investment manager.

Contact the Fund at 1-888-777-0102 for additional information, or consult the Fund''s web site at www.leggmason.com/cef.

All data and commentary provided within this press release is for informational purposes only. Legg Mason, Inc. and all of its affiliates do not engage in selling any of the shares of the Fund. The Fund''s common shares are traded on the New York Stock Exchange.

Contacts:

Legg Mason & Co. LLC
Brenda Grandell, 212-857-8087
Director, Closed-End Funds