UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 15

CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.

Commission File Number: 0-27938

Columbia Bancorp

(Exact name of registrant as specified in its charter)

401 East Third Street, Suite 200The Dalles, Oregon 97058

(541) 298-6649

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Common Stock, no par value

(Title of each class of securities covered by this Form)

None

(Titles of all other classes of securities for which a duty

to file reports under section 13(a) or 15(d) remains)

Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to terminate or suspend the duty to file reports:

Rule 12g-4(a)(1)          
Rule 12g-4(a)(2)          
Rule 12h-3(b)(1)(i)   
Rule 12h-3(b)(1)(ii)  
Rule 15d-6 [X]
[  ]
[  ]
[  ]
[  ] 

Approximate number of holders of record as of the certification or notice date:     None          

Pursuant to the requirements of the Securities Exchange Act of 1934, Columbia Bancorp has caused this certification/notice to be signed on its behalf by the undersigned duly authorized person.

Date: December 29, 2010                                              Columbia Bancorp

                                                                        By:         /s/ Terry L. Cochran                             

            Terry L. Cochran, President and CEO