Earnings Release. On October 16, 2012, Mercantile Bank Corporation issued a press release announcing earnings and other financial results for the quarter ended September 30, 2012. A copy of the press release is furnished as Exhibit 99.1 to this report and incorporated here by reference.

In accordance with General Instruction B.2 of Form 8-K, the information in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

(d) Exhibits.

Exhibit Number                                 Description

99.1                   Press release of Mercantile Bank Corporation reporting
                       financial results and earnings for the quarter ended
                       September 30, 2012.