EXHIBIT 99 (a)
CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2003
In connection with the Quarterly Report on Form 10-Q of Canandaigua National Corporation for the period ending March 31, 2003, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, George W. Hamlin, IV, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1)   The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2)   The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.
May 13, 2003	/s/ George W. Hamlin, IV
Date	George W. Hamlin, IV, Chief Executive Officer