    <SEC-DOCUMENT>0001140361-21-009924-index.html : 20210325
    <SEC-HEADER>0001140361-21-009924.hdr.sgml : 20210325
    <ACCEPTANCE-DATETIME>20210325104719
    ACCESSION NUMBER:		0001140361-21-009924
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		33
    CONFORMED PERIOD OF REPORT:	20210513
    FILED AS OF DATE:		20210325
    DATE AS OF CHANGE:		20210325

    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:		21770792

    	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>nc10018663x1_def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: nc10018663x1_def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>nc10018663x1_img01.jpg
    <TEXT>
    Document 2 - file: nc10018663x1_img01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>nc10018663x1_img02.jpg
    <TEXT>
    Document 3 - file: nc10018663x1_img02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>nc10018663x1_img03.jpg
    <TEXT>
    Document 4 - file: nc10018663x1_img03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>nc10018663x1_img04.jpg
    <TEXT>
    Document 5 - file: nc10018663x1_img04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>nc10018663x1_img05.jpg
    <TEXT>
    Document 6 - file: nc10018663x1_img05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>nc10018663x1_img06.jpg
    <TEXT>
    Document 7 - file: nc10018663x1_img06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>nc10018663x1_img07.jpg
    <TEXT>
    Document 8 - file: nc10018663x1_img07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>nc10018663x1_img08.jpg
    <TEXT>
    Document 9 - file: nc10018663x1_img08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>nc10018663x1_img09.jpg
    <TEXT>
    Document 10 - file: nc10018663x1_img09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>nc10018663x1_img10.jpg
    <TEXT>
    Document 11 - file: nc10018663x1_img10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>nc10018663x1_img11.jpg
    <TEXT>
    Document 12 - file: nc10018663x1_img11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>nc10018663x1_img12.jpg
    <TEXT>
    Document 13 - file: nc10018663x1_img12.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>nc10018663x1_img13.jpg
    <TEXT>
    Document 14 - file: nc10018663x1_img13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>nc10018663x1_img14.jpg
    <TEXT>
    Document 15 - file: nc10018663x1_img14.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>nc10018663x1_img15.jpg
    <TEXT>
    Document 16 - file: nc10018663x1_img15.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>nc10018663x1_img16.jpg
    <TEXT>
    Document 17 - file: nc10018663x1_img16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>nc10018663x1_img18.jpg
    <TEXT>
    Document 18 - file: nc10018663x1_img18.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>nc10018663x1_img19.jpg
    <TEXT>
    Document 19 - file: nc10018663x1_img19.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>nc10018663x1_img20.jpg
    <TEXT>
    Document 20 - file: nc10018663x1_img20.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>nc10018663x1_img21.jpg
    <TEXT>
    Document 21 - file: nc10018663x1_img21.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>nc10018663x1_img22.jpg
    <TEXT>
    Document 22 - file: nc10018663x1_img22.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>nc10018663x1_img23.jpg
    <TEXT>
    Document 23 - file: nc10018663x1_img23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>nc10018663x1_img24.jpg
    <TEXT>
    Document 24 - file: nc10018663x1_img24.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>nc10018663x1_img25.jpg
    <TEXT>
    Document 25 - file: nc10018663x1_img25.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>nc10018663x1_img26.jpg
    <TEXT>
    Document 26 - file: nc10018663x1_img26.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>nc10018663x1_img27.jpg
    <TEXT>
    Document 27 - file: nc10018663x1_img27.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>nc10018663x1_img28.jpg
    <TEXT>
    Document 28 - file: nc10018663x1_img28.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>nc10018663x1_img29.jpg
    <TEXT>
    Document 29 - file: nc10018663x1_img29.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>nc10018663x1_img30.jpg
    <TEXT>
    Document 30 - file: nc10018663x1_img30.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>nc10018663x1_img32.jpg
    <TEXT>
    Document 31 - file: nc10018663x1_img32.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>nc10018663x1_img33.jpg
    <TEXT>
    Document 32 - file: nc10018663x1_img33.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>nc10018663x1_img34.jpg
    <TEXT>
    Document 33 - file: nc10018663x1_img34.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>