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):

10/28/04

COLUMBIA BANKING SYSTEM, INC.

(Exact name of registrant as specified in its charter)

Washington	0-20288	91-1422237
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1301 A Street Tacoma, WA	98402
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (253) 305-1900

(Former name or former address, if changed since last report.)

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):

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

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

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

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

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition

On October 28, 2004, we issued a press release that Columbia Banking System, Inc. was issuing a $0.07 per share dividend. The dividend will be paid on November 24, 2004 to shareholders of record at the close of business November 10, 2004. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference in its entirety.

Item 9.01 Financial Statements and Exhibits

(a) Financial statements. – not applicable

(b) Pro forma financial information. – not applicable

(c) The following exhibit is being furnished herewith:

99.1 Press Release dated October 28, 2004 announcing a quarterly cash dividend.

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.

	COLUMBIA BANKING SYSTEM, INC.
Date: October 29, 2004
	/s/ Melanie J. Dressel
	Melanie J. Dressel
	President and Chief Executive Officer

EX-99.1

Exhibit 99.1

FOR IMMEDIATE RELEASE

October 28, 2004

Contacts:     Melanie J. Dressel, President and

Chief Executive Officer

(253) 305-1911

Gary R. Schminkey, Executive Vice President

and Chief Financial Officer

(253) 305-1966

COLUMBIA BANKING SYSTEM DECLARES

CASH DIVIDEND

TACOMA, Washington — William T. Weyerhaeuser, Chairman of the Board of Columbia Banking System, Inc. (Nasdaq: COLB) announced that a quarterly cash dividend of $0.07 per share will be paid on November 24, 2004 to shareholders of record as of the close of business on November 10, 2004. The approval of this dividend marks the seventh consecutive quarter that a cash dividend has been paid to shareholders, and represents an increase of 40% from the $0.05 per share paid each quarter during 2003.

Columbia Banking System, Inc. is a Tacoma-based bank holding company whose wholly owned bank subsidiaries are Columbia Bank and Bank of Astoria, which was acquired October 1, 2004. Columbia Bank is a Washington state-chartered full-service commercial bank with 34 banking offices in Pierce, King, Cowlitz, Kitsap and Thurston counties. Bank of Astoria, a federally insured commercial bank headquartered in Astoria, Oregon, operates four branches in Clatsop County: Astoria, Warrenton, Seaside and Cannon Beach; and one branch in Manzanita in Tillamook County.

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Note Regarding Forward Looking Statements

This news release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which can be identified by words such as “may,” “expected,” “anticipate”, “continue,” or other comparable words. In addition, all statements other than statements of historical facts that address activities that Columbia expects or anticipates will or may occur in the future are forward-looking statements. Readers are encouraged to read the SEC reports of Columbia, particularly its form 10-K for the Fiscal Year ended December 31, 2003, for meaningful cautionary language discussing why actual results may vary materially from those anticipated by management.