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 FOURTH QUARTER AND FULL YEAR 2010 EARNINGS

Coldwater, Michigan, February 18, 2011: Southern Michigan Bancorp, Inc. (OTCBB: SOMC.OB) reported net income of $3,098,000 for 2010 compared to $1,936,000 for 2009. Earnings per share were $1.34 for the full year of 2010 compared to $0.84 in 2009. Fourth quarter 2010 net income was $723,000 compared to $685,000 in the fourth quarter of 2009.

Total consolidated assets at December 31, 2010 were $493.9 million compared to $462.4 million at December 31, 2009.

During 2010, Southern provided $1,375,000 for loan losses, with an allowance for loan losses at December 31, 2010 of $5,694,000, or 1.84% of loans. This compared to provision expense of $2,725,000 for 2009, with an allowance at December 31, 2009 of $6,075,000, or 1.82% of loans. The decrease in the provision for loan losses resulted primarily from reduced net charge-offs and a reduction in specific reserves on impaired loans. Net charge-offs totaled $1,756,000 for 2010, down from $3,754,000 in 2009. Non-performing loans totaled $5,294,000 at December 31, 2010, or 1.71% of total loans, representing a decrease of $2,305,000, or 30.3% from December 31, 2009.

Southern's 3.95% net interest margin for 2010 remained strong when compared to peers. Southern's net interest margin was 4.14% for 2009. The decrease in net interest margin was attributable to reduced levels of loans in 2010, partially offset by a reduction in deposit rates.

Non-interest income for 2010 was slightly higher at $7,207,000 compared to $7,172,000 in 2009. The increase was primarily a result of increased gains on loan sales and gains on life insurance proceeds, partially offset by reduced service charges on deposit accounts and a reduction in investment security gains.

Total non-interest expense decreased $712,000, or $3.8%, for 2010 as compared to 2009. Professional and outside services expense decreased $413,000, or 30.5%, primarily due to costs associated with merging the two subsidiary banks in 2009. Automated teller machine expense decreased $188,000 in 2010 as compared to 2009, as the merger of the two subsidiary banks facilitated a conversion to one operating system in the fourth quarter of 2009. FDIC deposit insurance assessments were $215,000 lower in 2010 due to a one-time industry-wide special assessment in June of 2009. In addition, other real estate owned (OREO) expenses and loss on the sale of OREO totaled $410,000 for 2010, a decrease of $227,000, or 35.6%, as compared to the 2009 expense of $637,000.

The annualized return on average assets for 2010 and 2009 was 0.65% and 0.41%, respectively. The annualized return on average equity was 6.56% for 2010 compared to 4.29% for 2009.

John H. Castle, Chairman and Chief Executive Officer of Southern Michigan Bancorp, Inc., stated, "While we are pleased with both the revenue and expense improvements we achieved from 2009, we remain cautious about the year ahead and the realities facing the banking industry. The recently enacted Dodd-Frank regulatory reform legislation, including the Durbin amendment, and the Healthcare Reform bill, as they are currently written, will add additional complexity, reduce fee income, and add costs to the operations of all community banks."

Castle continued, "While we believe the emergence from the national recession will continue slowly over a prolonged period, 2011 should be a pivotal year for us. We will continue to closely monitor asset quality, as well as look for ways to increase operating efficiencies. Good progress was made in both of these critical areas during 2010, and we will continue to place emphasis on them again in 2011."

Southern Michigan Bancorp, Inc. is a bank holding company and the parent company of Southern Michigan Bank & Trust. It operates 17 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", "should", "continue", "look for" and other similar words or expressions. All statements with reference to a future time period are forward-looking. Management's determination of the provision and allowance for loan losses and other accounting estimates, such as the carrying value of goodwill and mortgage servicing rights 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. There can be no assurance that future loan losses will be limited to the amounts estimated. Our ability to successfully implement new programs and initiatives, increase efficiencies, respond to declines in collateral values and credit quality, and improve profitability is not entirely within our control and is not assured. The future effect of changes in the 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, extend, likelihood and degree of occurrence. Therefore, actual results and outcomes may materially differ from what may be expressed in or implied by such forward-looking statements. Southern Michigan Bancorp, Inc. does not undertake to update forward-looking statements to reflect the impact of circumstances or events that may arise after the date of the forward-looking statements.

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, 2009 and in "Part II, Item 1A - Risk Factors" of our Quarterly Report on Form 10-Q for the quarter ended September 30, 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)

SOUTHERN MICHIGAN BANCORP, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)