EXHIBIT 99.1

SOUTHERN MICHIGAN BANCORP, INC.
51 West Pearl Street
Coldwater, Michigan 49036

FOR IMMEDIATE RELEASE
CONTACT:  John H. Castle, CEO
(517) 279-5500

SOUTHERN MICHIGAN BANCORP, INC. ANNOUNCES FIRST
QUARTER 2011 EARNINGS

Coldwater, Michigan, April 29, 2011: Southern Michigan Bancorp, Inc. (OTCBB: SOMC.OB) reported net income of $748,000, or $0.32 per share, for the quarter ended March 31, 2011, compared to net income of $702,000, or $0.30 per share, for the first quarter of 2010.

Total consolidated assets at March 31, 2011 were $502.4 million compared to $493.9 million at December 31, 2010.

Southern provided $125,000 for loan losses during the first quarter of 2011, resulting in an allowance for loan losses of $5,576,000, or 1.82% of loans at March 31, 2011. This compared to $200,000 of provision expense for the first quarter of 2010, and an allowance of 1.83% of loans at March 31, 2010. The decrease in the provision for loan losses resulted primarily from reduced charge-offs and lower loan balances. Net charge-offs totaled $243,000 for the first quarter of 2011, compared to $332,000 during the first quarter of 2010.

The annualized return on average assets for both three month periods ended March 31, 2011 and 2010 was 0.60%. The annualized return on average equity was 6.19% for the first quarter of 2011 compared to 6.08% for the first quarter of 2010.

John H. Castle, Chairman and Chief Executive Officer of Southern Michigan Bancorp, Inc., stated, "Southern continues to have the benefit of strong levels of capital and liquidity, while maintaining solid profitability in a difficult operating environment. Although loan demand has been sluggish, we are beginning to see renewed demand from creditworthy borrowers. We expect to see loan growth throughout the remainder of 2011. In addition, a number of cost saving measures were implemented during the first quarter of 2011 that we believe will provide enhanced earnings as the year progresses."

Southern Michigan Bancorp, Inc. is a bank holding company and the parent company of Southern Michigan Bank & Trust. It operates 16 branches within Branch, Calhoun, Cass, Hillsdale and St. Joseph Counties, providing a broad range of consumer, business and wealth management services throughout the region.

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This press release contains forward-looking statements that are based on management's beliefs, assumptions, current expectations, estimates and projections about the financial services industry, the economy, and Southern Michigan Bancorp, Inc. Forward-looking statements are identifiable by words or phrases such as "will," "believe," "continue," "beginning," "expect," and other similar words or phrases. Such statements are based upon current beliefs and expectations and involve substantial risks and uncertainties which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These statements include, among others, statements related to future capital and liquidity levels, future loan demand and growth, the future effect of cost saving measures, and future levels of earnings. Management's determination of the provision and allowance for loan losses, the appropriate carrying value of intangible assets (including goodwill, mortgage servicing rights and deferred tax assets) and other real estate owned, and the fair value of investment securities (including whether any impairment on any investment security is temporary or other-than-temporary and the amount of any impairment) involves judgments that are inherently forward-looking. Management's assumptions regarding pension and other post retirement plans involve judgments that are inherently forward-looking. Our ability to sell other-real-estate owned at its carrying value or at all, successfully implement new programs and initiatives, increase efficiencies, respond to declines in collateral values and credit quality, maintain our current level of deposits and other sources of funding, and improve profitability is not entirely within our control and is not assured. The future effect of changes in the real estate, financial and credit markets and the national and regional economy on the banking industry, generally, and Southern Michigan Bancorp, Inc., specifically, are also inherently uncertain. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions ("risk factors") that are difficult to predict with regard to timing, extent, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what may be expressed or forecasted in such forward-looking statements. We undertake no obligation to update or revise our forward-looking statements to reflect developments that occur or information obtained after the date of this report.

Risk factors include, but are not limited to, the risk factors described in "Item 1A - Risk Factors" of our Annual Report on Form 10-K for the year ended December 31, 2010. These and other factors are representative of the risk factors that may emerge and could cause a difference between an ultimate actual outcome and a preceding forward-looking statement.

SOUTHERN MICHIGAN BANCORP, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED)
(In thousands, except share data)

SOUTHERN MICHIGAN BANCORP, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
(In thousands, except per share data)