Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

(a) On April 28, 2009, the Board of Directors of Costco Wholesale Corporation adopted amendments to the Company's bylaws. The amendments to the Bylaws made the following substantive changes:

1. Section 2.1. Amendments were made to the requirements for a shareholder to present a proposal to a meeting of shareholders, including the information that a shareholder must provide in connection with a proposal.

2. Section 2.2. Amendments were made to the notice requirements for a shareholder to call a special meeting of shareholders.

3. Section 2.3. Amendments were made to notice provisions to permit the Company to provide notice to shareholders electronically and for shareholders to provide notice to the Company electronically.

4. Section 2.9. This section was amended to conform to Washington law, which allows action by written shareholder consent only if unanimous.

5. Section 3.13. Amendments were made to permit the consent of a director to be delivered electronically.

Item 8.01. Other Events

The Board of Directors declared a quarterly cash dividend on Costco Wholesale common stock and approved an increase from $.16 to $.18. The dividend of $.18 per share declared is payable May 29, 2009, to shareholders of record at the close of business on May 15, 2009.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits. The following exhibits are included in this report:

3.1. Amended and Restated Bylaws, effective April 28, 2009

99.1. Press release dated April, 28, 2009.

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