Middlefield Banc Corp. Announces Third Quarter 2009 Cash Dividend

MIDDLEFIELD, Ohio, Aug. 17 /PRNewswire-FirstCall/ -- Middlefield Banc Corp.
(Pink Sheets: MBCN) today announced that the company's board of directors has
declared a quarterly cash dividend of $0.26 per common share payable on
September 15, 2009, to shareholders of record on August 31, 2009. This cash
dividend represents an amount equal to that paid in the prior quarter of 2009
as well as the amount paid during the third quarter of 2008.

Thomas G. Caldwell, President and Chief Executive Officer of Middlefield,
commented, "We are very aware that many banks have greatly reduced, and in
some cases eliminated, the payment of dividends as they work to address
capital concerns. Although our capital levels have remained strong, our board
has considered many options relative to quarterly dividends. The decision to
declare a cash dividend for the third quarter is evidence of our financial
strength and profitability, as well as our commitment to reward our
shareholders for the confidence and support that they have shown in
Middlefield Banc Corp."

Middlefield Banc Corp., headquartered in Middlefield, Ohio, is a financial
holding company with total assets in excess of $475 million. Its subsidiary,
The Middlefield Banking Company, operates full service banking centers and a
UVEST Financial Services(R) brokerage office serving Chardon, Cortland,
Garrettsville, Mantua, Middlefield, Newbury and Orwell, Ohio. The company
also serves the central Ohio market through its Emerald Bank subsidiary, with
offices in Dublin and Westerville, Ohio. Additional information is available
at www.middlefieldbank.com and www.emeraldbank.com.

This announcement contains forward-looking statements that involve risk and
uncertainties, including changes in general economic and financial market
conditions and the Company's ability to execute its business plans. Although
management believes the expectations reflected in such statements are
reasonable, actual results may differ materially.

Contact: James R. Heslop, 2nd
Executive Vice President/Chief Operating Officer
(440) 632-1666 Ext. 3219
jheslop@middlefieldbank.com

SOURCE Middlefield Banc Corp.

James R. Heslop, 2nd, Executive Vice President/Chief Operating Officer of
Middlefield Banc Corp, +1-440-632-1666, Ext. 3219,
jheslop@middlefieldbank.com