<ACCESSION-NUMBER>0001144204-19-035286 <TYPE>8-K <PUBLIC-DOCUMENT-COUNT>4 <PERIOD>20190722 <ITEMS>2.02 <ITEMS>9.01 <FILING-DATE>20190722 <DATE-OF-FILING-DATE-CHANGE>20190722 <FILER> <COMPANY-DATA> <CONFORMED-NAME>COMMUNITY BANK SYSTEM, INC. <CIK>0000723188 <ASSIGNED-SIC>6021 <IRS-NUMBER>161213679 <STATE-OF-INCORPORATION>DE <FISCAL-YEAR-END>1231 </COMPANY-DATA> <FILING-VALUES> <FORM-TYPE>8-K <ACT>34 <FILE-NUMBER>001-13695 <FILM-NUMBER>19964768 </FILING-VALUES> <BUSINESS-ADDRESS> <STREET1>5790 WIDEWATERS PKWY <CITY>DEWITT <STATE>NY <ZIP>13214 <PHONE>8007242262 </BUSINESS-ADDRESS> <MAIL-ADDRESS> <STREET1>5790 WIDEWATERS PARKWAY <CITY>DEWITT <STATE>NY <ZIP>13214 </MAIL-ADDRESS> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>COMMUNITY BANK NA, a subsidiary of Community Bank System Inc <DATE-CHANGED>20130729 </FORMER-COMPANY> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>COMMUNITY BANK NA, a subsidiary of Community Bank System Inc. <DATE-CHANGED>20130726 </FORMER-COMPANY> <FORMER-COMPANY> <FORMER-CONFORMED-NAME>COMMUNITY BANK SYSTEM INC <DATE-CHANGED>19920703 </FORMER-COMPANY> </FILER>