<SEC-DOCUMENT>0001193125-18-207627-index.html : 20180628
<SEC-HEADER>0001193125-18-207627.hdr.sgml : 20180628
<ACCEPTANCE-DATETIME>20180628161808
ACCESSION NUMBER:		0001193125-18-207627
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20180628
DATE AS OF CHANGE:		20180628
EFFECTIVENESS DATE:		20180628

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-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-225955
		FILM NUMBER:		18925544

	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-8
<SEQUENCE>1
<FILENAME>d711135ds8.htm
<DESCRIPTION>S-8
<TEXT>
Document 1 - file: d711135ds8.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d711135dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d711135dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d711135dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d711135dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>4
<FILENAME>d711135dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 4 - file: d711135dex991.htm

</DOCUMENT>
</SEC-DOCUMENT>