NEWS RELEASE

BW Account Number:  1079001
Date:  May 16, 2005     5:00 p.m. E.S.T.
Contact:        James L. Saner, Sr., President and CEO
                MainSource Financial Group, Inc.  812-663-0157

                        Second Quarter Dividend Declared       [MainSource Logo]
                    MainSource Financial Group - NASDAQ, MSFG

Greensburg, Indiana (NASDAQ: MSFG) - MainSource Financial Group's Board of
Directors announced today that the Company declared a second quarter common
dividend of $.13 per share at its May 16, 2005 meeting. The dividend is payable
on June 15, 2005 to common shareholders of record as of June 1, 2005. The
dividend represents a 9.2% increase over the dividend paid to shareholders in
the second quarter last year. This is MainSource Financial Group's fifty-ninth
consecutive quarterly cash dividend.

James L. Saner, Sr., President and CEO of MainSource Financial Group, stated,
"The increase in our quarterly dividend reaffirms our commitment to reward the
shareholders of MainSource Financial Group and reflects our continued strong
profitability in a challenging economic environment."

MainSource Financial Group, Inc., headquartered in Greensburg, Indiana, is
listed on the NASDAQ National Market (under the symbol: "MSFG") and is a
community-focused, financial holding company with assets of approximately $1.5
billion. The Company operates 54 offices in 22 Indiana counties and six offices
in three Illinois counties through its three banking subsidiaries, MainSource
Bank, Greensburg, Indiana; Peoples Trust Company, Linton, Indiana; and
MainSource Bank of Illinois, Kankakee, Illinois. Through its non-banking
subsidiaries, MainSource Insurance LLC, MainSource Title LLC, and MainSource
Mortgage LLC, the Company provides various related financial services through
the Company's banking affiliates.

Forward-Looking Statements

Except for historical information contained herein, the discussion in this press
release may include certain forward-looking statements based upon management
expectations. Factors which could cause future results to differ from these
expectations include the following: general economic conditions; legislative and
regulatory initiatives; monetary and fiscal policies of the federal government;
deposit flows; the costs of funds; general market rates of interest; interest
rates on competing investments; demand for loan products; demand for financial
services; changes in accounting policies or guidelines; and changes in the
quality or composition of the Company's loan and investment portfolios.

The forward-looking statements included in the press release relating to certain
matters involve risks and uncertainties, including anticipated financial
performance, business prospects, and other similar matters, which reflect
management's best judgment based on factors currently known. Actual results and
experience could differ materially from the anticipated results or other
expectations expressed in the Company's forward-looking statements as a result
of a number of factors, including but not limited to, those discussed in the
press release.

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 MainSource Financial Group, 201 N. Broadway, P.O. Box 87, Greensburg, IN 47240