Melanie J. Dressel, President and Chief Executive Officer of Columbia Banking System, Inc., presides over the closing bell.

Monday September 10, 2007
from Nasdaq MarketSite
in New York's Times Square

Columbia Banking System, Inc.
[COLB]

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is a 53-branch Tacoma-based bank holding company whose wholly owned banking subsidiaries are Columbia Bank and Bank of Astoria. Columbia Bank is a Washington state-chartered full-service commercial bank. With the July 23, 2007 completion of the acquisitions of Mountain Bank Holding Company and Town Center Bancorp, Columbia Bank has 48 banking offices in Pierce, King, Cowlitz, Kitsap and Thurston counties in Washington State, and Clackamas and Multnomah counties in Oregon. Included in Columbia Bank are former branches of Mt. Rainier National Bank, doing business as Mt. Rainier Bank, with 7 branches in King and Pierce 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. More information about Columbia can be found on its website at www.columbiabank.com.

Columbia's strong commitment to highly personalized service, varied products and long-standing community presence attracts experienced, talented bankers. Our bankers work closely with our customers, emphasizing personalized, local decision-making in each of the markets they serve. Columbia offers the varied menu of relationship banking products and sophistication of a regional bank, while retaining the appeal and service level of a community bank.

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Click for larger pictures of the NASDAQ MarketSite. Additional Photographs for 09/10/2007 Download Hi-Res Quality Photo of this NASDAQ Market Open - Pictured: Melanie J. Dressel, President and Chief Executive Officer of Columbia Banking System, Inc., presides over the closing bell. Organizations interested in obtaining NASDAQ-listed company bell ringing ceremony photographs for press purposes, must first receive approval from the listed company before requesting photographs from NASDAQ. Please provide the company contact information from whom you received approval to Jolene Libretto at Jolene.Libretto@nasdaq.com. Kindly credit © 2007, The Nasdaq Stock Market, Inc. Reprinted with permission. © Copyright 2007, The NASDAQ Stock Market, Inc. Reprinted with the permission of The Nasdaq Stock Market, Inc.