Exhibit 15
May 9, 2025
Securities and Exchange Commission
450 Fifth Street, NW
Washington, DC 20549
RE: FILING OF THE MARCH 31, 2025 FORM 10-Q FOR TRUSTCO BANK CORP NY
Commissioners:
We are aware that our report dated May 9, 2025, on our reviews of the interim financial information of TrustCo Bank Corp NY as of
March 31, 2025 and for the three-month periods ended March 31, 2025 and 2024, included in the Company's quarterly report on Form 10-Q for the quarter ended March 31, 2025, is incorporated by reference in its Registration Statements, Form S-8 (No.
333-175868), Form S-8 (No. 333-233122), Form S-8 (No. 333-175867), Form S-8 (No. 333-206685), Form S-8 (333-272169), and Form S-3 (333-272184).
Yours very truly,
/s/ Crowe LLP