Exhibit 99.1

                                  NEWS RELEASE

Date:           July 20, 2005   11:30 a.m. E.S.T.
Contact:        James L. Saner, Sr., President and CEO
                MainSource Financial Group, Inc.  812-663-0157

                                               [MainSource Financial Group logo]

                  MAINSOURCE FINANCIAL GROUP - NASDAQ, MSFG -
                 Announces Earnings for the Second Quarter 2005


+        Net Income of $4.3 million

+        Return on Average Equity of 13.66%

+        Return on Average Assets of 1.15%

+        Net Interest Margin of 4.04%


James L.  Saner,  Sr.,  President  & CEO of  MainSource  Financial  Group,  Inc.
(NASDAQ:  MSFG),  announced  today the unaudited  results for the second quarter
ended June 30,  2005.  Total net income for the second  quarter  was  $4,326,000
compared  to  $4,319,000  for the same  period  in 2004.  The  Company  reported
earnings per share of $0.37,  which  represents a 2.6% decrease  compared to the
$0.38 per share  reported  in the  second  quarter of 2004.  In June  2005,  the
Company  completed a public  offering  of  approximately  1.7 million  shares of
common stock.  As previously  announced,  the majority of the proceeds from this
offering will be used in the  acquisition of The Madison Bank and Trust Company,
which is expected to close in the third quarter of 2005. Excluding the effect of
the additional shares issued in the offering,  the Company's  earnings per share
would have been  $0.38.  For the six months  ended June 30,  2005,  the  Company
reported earnings per share of $0.70,  which represents a 1.4% decrease over the
$0.71 reported for the same period a year ago.

Key measures of the financial  performance  of the Company are return on average
shareholders'   equity  and  return  on  average   assets.   Return  on  average
shareholders' equity was 13.66% for the second quarter of 2005 and the return on
average  assets  was 1.15% for the second  quarter  of 2005.  For the six months
ended June 30, 2005, the Company's  return on average  shareholders'  equity was
12.96% and the return on average assets was 1.08%.

Mr. Saner stated,  "We are pleased with our  performance  in the second  quarter
given the fact that we will not be able to fully  utilize the proceeds  from our
recent stock  offering  until the third  quarter.  Although our numbers are down
slightly from the second  quarter of 2004,  we showed a significant  improvement
over the first quarter of this year.  On a linked  quarter  basis,  earnings per
share,  return on average  assets,  return on average  equity,  and net interest
margin all increased substantially."

NET INTEREST INCOME

Net  interest  income was $13.2  million for the second  quarter of 2005,  which
represents  an  increase  of 7.3%  versus  the second  quarter of 2004.  Average
earning assets  increased  4.6% while net interest  margin,  on a  fully-taxable
equivalent basis, was 4.04% for the second quarter of 2005 compared to 3.85% for
the same  period a year  ago.  For the six  months  ended  June  30,  2005,  the
Company's net interest margin was 3.95% versus 3.79% a year ago.

NON-INTEREST INCOME

Non-interest  income was $4.8 million for the second quarter of 2005 compared to
$5.3 million for the same period a year ago.  This decrease was primarily due to



a decrease in  mortgage  banking  income and lower gains on sales of  investment
securities.  In addition,  insurance  commission income decreased as the Company
disposed of the Kentucky division of its insurance subsidiary in March 2005. The
Company's Indiana  insurance  division realized an increase in commission income
of 9% compared to the same period a year ago.

NON-INTEREST EXPENSE

Non-interest  expense for the second  quarter of 2005 was $11.9  million and was
relatively  flat compared to $11.7 million for the second  quarter of 2004.  The
Company was able to keep  expenses  flat year over year despite the full quarter
effect of Peoples  Trust Company in 2005,  which was acquired in mid-June  2004.
The  Company is  beginning  to realize  the cost  savings  anticipated  with the
consolidation of its Indiana bank charters.

ASSET QUALITY

As expected,  the Company's asset quality  improved during the second quarter of
2005.  Non-performing assets totaled $14.3 million, or 0.93% of total assets, as
of June 30, 2005.  The Company had $17.6 million of  non-performing  assets,  or
1.18% of total assets as of March 31, 2005, and $15.7 million, or 1.02% of total
assets at year-end  2004.  The allowance for loan losses was $11.3 million as of
June 30, 2005 which represented 1.23% of total outstanding loans.

Mr. Saner  stated,  "Our efforts to reduce our  non-performing  assets have been
successful  over the last quarter as we continue to improve the asset quality of
the Company. This continues to be a major focus for our Company in 2005."

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 and its banking  subsidiaries  provide various related
financial services.


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 materially 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.







                                                   MAINSOURCE FINANCIAL GROUP
                                                           (unaudited)
                                          (Dollars in thousands except per share data)

Income Statement Summary                                        Three months ended June 30           Six months ended June 30
                                                                  2005             2004              2005               2004
                                                              -------------    --------------    --------------    ---------------
                                                                                                      
    Interest Income                                         $19,533          $17,474            $38,226           $34,238

    Interest Expense                                          6,348            5,190             12,336            10,482
                                                              -------------    --------------    --------------    ---------------
    Net Interest Income
                                                              13,185           12,284            25,890            23,756

    Provision for Loan Losses                                 340              60                460               60
    Noninterest Income:

          Insurance commissions                               523              691               1,110             1,389

          Mortgage banking                                    679              919               1,225             1,718

          Service charges on deposit accounts                 1,805            1,720             3,471             3,258


          Gain on sales of securities                         213              437               224               773

          Other                                               1,619            1,495             3,388             2,771
                                                              -------------    --------------    --------------    ---------------
                    Total Noninterest Income
                                                              4,839            5,262             9,418             9,909
    Noninterest Expense:

          Employee                                            6,886            6,639             13,762            13,080

          Occupancy                                           824              762               1,723             1,520

          Equipment                                           985              932               2,015             1,864

          Intangible amortization                             295              232               590               466

          Other                                               2,873            3,131             5,867             5,730
                                                              -------------    --------------    --------------    ---------------
                    Total Noninterest Expense
                                                              11,863           11,696            23,957            22,660

    Earnings Before Income Taxes                              5,821            5,790             10,891            10,945

    Provision for Income Taxes                                1,495            1,471             2,775             2,991
                                                              -------------    --------------    --------------    ---------------
    Net Income                                                 $                $                 $                 $
                                                              4,326            4,319             8,116             7,954
                                                              =============    ==============    ==============    ===============

                                                                Three months ended June 30           Six months ended June 30
Average Balance Sheet Data                                        2005             2004              2005               2004
                                                              -------------    --------------    --------------    ---------------
    Gross Loans                                                   $911,109          $872,244          $915,978           $861,891

    Earning Assets                                            1,370,550        1,310,468         1,367,062         1,295,518

    Total Assets                                              1,519,903        1,450,647         1,516,225         1,434,213

    Noninterest Bearing Deposits                              140,007          125,800           137,831           121,069

    Interest Bearing Deposits                                 1,062,596        1,051,637         1,064,552         1,043,566

    Total Interest Bearing Liabilities                        1,241,673        1,204,154         1,241,324         1,193,604

    Shareholders' Equity                                      128,394          109,408           126,290           108,310

                                                                Three months ended June 30           Six months ended June 30
Per Share Data                                                    2005             2004              2005               2004
                                                              -------------    --------------    --------------    ---------------
    Diluted Earnings Per Share                                       $0.37             $0.38             $0.70              $0.71

    Cash Dividends Per Share                                  0.130            0.119             0.260             0.233

    Market Value - High                                       21.62            23.96             22.92             23.07

    Market Value - Low                                        17.30            17.30             17.81             17.81

    Average Outstanding Shares (diluted)                      11,751,831       11,230,427        11,649,538        11,182,721

                                                                Three months ended June 30           Six months ended June 30
Key Ratios                                                        2005             2004              2005               2004
                                                              -------------    --------------    --------------    ---------------
    Return on Average Assets                                         1.15%             1.20%             1.08%              1.12%
    Return on Average Equity                                        13.66%            15.85%            12.96%             14.73%
    Net Interest Margin                                              4.04%             3.85%             3.95%              3.79%
    Efficiency Ratio                                                64.20%            65.74%            66.24%             66.04%
    Net Overhead to Average Assets                                   1.87%             1.78%             1.93%              1.79%

Balance Sheet Highlights
As of June 30                                                     2005             2004
                                                              -------------    --------------
    Total Loans (Excluding Loans Held for Sale)                   $913,326          $946,204

    Allowance for Loan Losses                                 11,275           12,254

    Total Securities                                          446,400          432,494

    Goodwill and Intangible Assets                            45,150           47,193

    Total Assets                                              1,540,386        1,552,494

    Noninterest Bearing Deposits                              146,398          138,509

    Interest Bearing Deposits                                 1,104,036        1,079,488

    Other Borrowings                                          123,308          209,513

    Shareholders' Equity                                      155,047          114,242


Other Balance Sheet Data
As of June 30                                                     2005             2004
                                                              -------------    --------------
    Book Value Per Share                                            $11.74             $9.89
    Loan Loss Reserve to Loans                                       1.23%             1.30%
    Nonperforming Assets to Total Assets                             0.93%             0.84%

    Outstanding Shares                                        13,210,268       11,551,357

Asset Quality
As of June 30                                                     2005             2004
                                                              -------------    --------------
    Loans Past Due 90 Days or More and Still Accruing                 $257              $225

    Non-accrual Loans                                         12,894           10,525

    Other Real Estate Owned                                   1,175            2,282
                                                              -------------    --------------
    Total Nonperforming Assets                                     $14,326           $13,032