POWER OF ATTORNEY

                               James J. Herzog

	Know all by these presents, that the undersigned hereby constitutes and
appoints each of John D. Buchanan, Nicole V. Gersch, Jennifer S. Perry and
Owen M. Scheurich, signing singly, the undersigned's true and lawful
attorney-in-fact to:

	(1)	execute for and on behalf of the undersigned Forms 3, 4 and 5 in
                accordance with Section 16(a) of the Securities Exchange Act of
                1934 and the rules thereunder and Form 144 with respect to the
                securities of Comerica Incorporated (the "Company") beneficially
                owned by the undersigned in accordance with Rule 144 under the
                Securities Act of 1933 (the "Securities Act");

	(2)	execute for and on behalf of the undersigned documents necessary
                to facilitate the filing of Forms 3, 4 and 5 and Form 144;

	(3)	do and perform any and all acts for and on behalf of the
                undersigned which may be necessary or desirable to complete and
                execute any such Form 3, 4 or 5 or Form 144, complete and
		execute any amendment or amendments thereto, and timely file
		such form with the United States Securities and Exchange
		Commission and any stock exchange or similar authority; and

	(4)	take any other action of any type whatsoever in connection with
		the foregoing which, in the opinion of such attorney-in-fact,
		may be of benefit to, in the best interest of, or legally
		required by, the undersigned, it being understood that the
		documents executed by such attorney-in-fact on behalf of the
		undersigned pursuant to this Power of Attorney shall be in such
		form and shall contain such terms and conditions as such
		attorney-in-fact may approve in such attorney-in-fact's
		discretion.

	The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and all purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934 or Rule 144 under the Securities Act.






	The termination of any attorney-in-fact's employment by the Company,
however caused, shall operate as a termination of his or her powers and
authorities hereunder, but shall not affect the powers and authorities herein
granted to any other party.

	This Power of Attorney shall remain in full force and effect until six
months from the date the undersigned is terminated or removed, or resigns or
retires from the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact at the then current
mailing address of the Corporate Legal Department of Comerica Incorporated.

	All Powers of Attorney previously granted in connection with the
foregoing matters hereby are canceled and revoked.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed and made effective as of the 12th day of September, 2019.



/s/ 	James J. Herzog
____________________________________
	James J. Herzog