    <SEC-DOCUMENT>0000842517-21-000168-index.html : 20210910
    <SEC-HEADER>0000842517-21-000168.hdr.sgml : 20210910
    <ACCEPTANCE-DATETIME>20210810150444
    <PRIVATE-TO-PUBLIC>
    ACCESSION NUMBER:		0000842517-21-000168
    CONFORMED SUBMISSION TYPE:	CORRESP
    PUBLIC DOCUMENT COUNT:		2
    FILED AS OF DATE:		20210810

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ISABELLA BANK Corp
    		CENTRAL INDEX KEY:			0000842517
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				382830092
    		STATE OF INCORPORATION:			MI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		CORRESP

    	BUSINESS ADDRESS:
    		STREET 1:		401 NORTH MAIN STREET
    		CITY:			MT PLEASANT
    		STATE:			MI
    		ZIP:			48858
    		BUSINESS PHONE:		9897729471

    	MAIL ADDRESS:
    		STREET 1:		401 NORTH MAIN STREET
    		CITY:			MT PLEASANT
    		STATE:			MI
    		ZIP:			48858

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ISABELLA BANK CORP
    		DATE OF NAME CHANGE:	20080602

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	IBT BANCORP INC /MI/
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>CORRESP
    <SEQUENCE>1
    <FILENAME>filename1.htm
    <TEXT>
    Document 1 - file: filename1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>ibclogoa04a.jpg
    <DESCRIPTION>ISBA LOGO
    <TEXT>
    Document 2 - file: ibclogoa04a.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>