<SEC-DOCUMENT>0001193125-17-134896-index.html : 20170424
<SEC-HEADER>0001193125-17-134896.hdr.sgml : 20170424
<ACCEPTANCE-DATETIME>20170424173010
ACCESSION NUMBER:		0001193125-17-134896
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20170424
DATE AS OF CHANGE:		20170424

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA BANKING SYSTEM INC
		CENTRAL INDEX KEY:			0000887343
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				911422237
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-216039
		FILM NUMBER:		17779117

	BUSINESS ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402
		BUSINESS PHONE:		2533051900

	MAIL ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402
</SEC-HEADER>
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<SEQUENCE>1
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Document 1 - file: d286121d424b3.htm

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Document 2 - file: g286121g02d65.jpg

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Document 3 - file: g286121g08y17.jpg

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<FILENAME>g286121g12t13.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g286121g12t13.jpg

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<SEQUENCE>5
<FILENAME>g286121g28n15.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g286121g28n15.jpg

</DOCUMENT>
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<SEQUENCE>6
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<DESCRIPTION>GRAPHIC
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Document 6 - file: g286121g32k81.jpg

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<SEQUENCE>7
<FILENAME>g286121g46q59.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g286121g46q59.jpg

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<SEQUENCE>8
<FILENAME>g286121g59w72.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g286121g59w72.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g286121g70g99.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g286121g70g99.jpg

</DOCUMENT>
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