8-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 12, 2006

Chemical Financial Corporation
(Exact Name of Registrant as
Specified in its Charter)

Michigan
(State or Other Jurisdiction
of Incorporation) 000-08185
(Commission
File Number) 38-2022454
(IRS Employer
Identification No.)

333 E. Main Street
Midland, Michigan
(Address of Principal Executive Offices)
48640
(Zip Code)

Registrant's telephone number, including area code:  (989) 839-5350

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01 Regulation FD Disclosure

                    On May 12, 2006, Chemical Financial Corporation issued the press release attached as Exhibit 99.1 to this Form 8-K, which is here incorporated by reference. This Report and the Exhibit are furnished to, and not filed with, the Commission.

Item 9.01	Financial Statements and Exhibits.
	(d)	Exhibits:
		99.1	Press Release dated May 12, 2006. This Exhibit is furnished to, and not filed with, the Commission.

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SIGNATURES

                    Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated:	May 12, 2006	CHEMICAL FINANCIAL CORPORATION (Registrant)
		/s/ Lori A. Gwizdala
		Lori A. Gwizdala      Executive Vice President, Chief Financial      Officer and Treasurer

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EXHIBIT INDEX

Exhibit Number	Document
99.1	Chemical Financial Corporation Press Release dated May 12, 2006. This Exhibit is furnished to, and not filed with, the Commission.

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EX-99.1

EXHIBIT 99.1

NASDAQ:	CHFC
FOR:	Immediate Release
DATE:	May 12, 2006
CONTACT:	David B. Ramaker Chairman, President and CEO Chemical Financial Corporation (517)839-5269

Chemical Financial Corporation To Acquire Branch Offices

Midland, MI . . . Chemical Financial Corporation today announced that it has reached an agreement to acquire two branch offices from First Financial Bank, N. A., headquartered in Hamilton, Ohio. The offices, located at 241 West State Street, Hastings, Michigan and 12850 West M-179 Highway, Wayland, Michigan, operating as Sand Ridge Bank, will further strengthen Chemical Bank's branch network as part of its Grand Rapids Community Bank. The branches have combined deposits and loans of approximately $44 million and $71 million, respectively.

David B. Ramaker, Chairman, President and CEO of Chemical Financial Corporation, commented, "We are extremely pleased with the opportunity to expand Chemical Bank's branch banking network. We believe strongly in providing quality personalized customer service and feel our brand of community banking will create perfect chemistry with the residents of Hastings and Wayland. We look forward to servicing the banking needs of our new customers, and becoming a part of their communities." The transaction is expected to close in the third quarter of 2006 and is subject to regulatory approval.

Chemical Financial Corporation is the fourth largest bank holding company headquartered in Michigan. The Company operates through a single subsidiary bank, Chemical Bank, with 124 banking offices spread over 32 counties in the lower peninsula of Michigan. At March 31, 2006, the Company had total assets of $3.74 billion. Chemical Financial Corporation common stock trades on The Nasdaq Stock Market under the symbol CHFC and is one of the issues comprising the Nasdaq Financial 100 index.