<SEC-DOCUMENT>0001193125-14-320312-index.html : 20140826
<SEC-HEADER>0001193125-14-320312.hdr.sgml : 20140826
<ACCEPTANCE-DATETIME>20140825183327
ACCESSION NUMBER:		0001193125-14-320312
CONFORMED SUBMISSION TYPE:	S-4
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20140826
DATE AS OF CHANGE:		20140825

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:		S-4
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-198356
		FILM NUMBER:		141063447

	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>
<DOCUMENT>
<TYPE>S-4
<SEQUENCE>1
<FILENAME>d764502ds4.htm
<DESCRIPTION>S-4
<TEXT>
Document 1 - file: d764502ds4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d764502dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d764502dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-8.1
<SEQUENCE>3
<FILENAME>d764502dex81.htm
<DESCRIPTION>EX-8.1
<TEXT>
Document 3 - file: d764502dex81.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.3
<SEQUENCE>4
<FILENAME>d764502dex233.htm
<DESCRIPTION>EX-23.3
<TEXT>
Document 4 - file: d764502dex233.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.4
<SEQUENCE>5
<FILENAME>d764502dex234.htm
<DESCRIPTION>EX-23.4
<TEXT>
Document 5 - file: d764502dex234.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.3
<SEQUENCE>6
<FILENAME>d764502dex993.htm
<DESCRIPTION>EX-99.3
<TEXT>
Document 6 - file: d764502dex993.htm

</DOCUMENT>
</SEC-DOCUMENT>