    <SEC-DOCUMENT>0000723188-17-000013-index.html : 20170331
    <SEC-HEADER>0000723188-17-000013.hdr.sgml : 20170331
    <ACCEPTANCE-DATETIME>20170331103427
    ACCESSION NUMBER:		0000723188-17-000013
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		7
    CONFORMED PERIOD OF REPORT:	20170331
    FILED AS OF DATE:		20170331
    DATE AS OF CHANGE:		20170331
    EFFECTIVENESS DATE:		20170331

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			COMMUNITY BANK SYSTEM, INC.
    		CENTRAL INDEX KEY:			0000723188
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		IRS NUMBER:				161213679
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13695
    		FILM NUMBER:		17728546

    	BUSINESS ADDRESS:
    		STREET 1:		5790 WIDEWATERS PKWY
    		CITY:			DEWITT
    		STATE:			NY
    		ZIP:			13214
    		BUSINESS PHONE:		8007242262

    	MAIL ADDRESS:
    		STREET 1:		5790 WIDEWATERS PARKWAY
    		CITY:			DEWITT
    		STATE:			NY
    		ZIP:			13214

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	COMMUNITY BANK NA, a subsidiary of Community Bank System Inc
    		DATE OF NAME CHANGE:	20130729

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	COMMUNITY BANK NA, a subsidiary of Community Bank System Inc.
    		DATE OF NAME CHANGE:	20130726

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	COMMUNITY BANK SYSTEM INC
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>formdef14a2017march31proxy.htm
    <TEXT>
    Document 1 - file: formdef14a2017march31proxy.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>cbufulllogo.jpg
    <TEXT>
    Document 2 - file: cbufulllogo.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>cbulogo.jpg
    <TEXT>
    Document 3 - file: cbulogo.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>cbulogomini.jpg
    <TEXT>
    Document 4 - file: cbulogomini.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>dcsignature.jpg
    <TEXT>
    Document 5 - file: dcsignature.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>proxyinviteform.jpg
    <TEXT>
    Document 6 - file: proxyinviteform.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>proxyvotingform.jpg
    <TEXT>
    Document 7 - file: proxyvotingform.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>