EXHIBIT 31.1
                  CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
            PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Larry J. Miller, President and CEO, certify, that:

1.       I have reviewed this quarterly report on Form 10-Q of Codorus Valley
Bancorp, Inc.;

2.       Based on my knowledge, this quarterly report does not contain any
untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this
quarterly report;

3.       Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

4.       The registrant's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

a)       designed such disclosure controls and procedures to ensure that
material information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this quarterly report is being prepared;

b)       evaluated the effectiveness of the registrant's disclosure controls and
procedures as of June 30, 2003; and

c)       presented in this quarterly report our conclusions about the
effectiveness of the disclosure controls and procedures based on our evaluation
as of the Evaluation Date;

5.       The registrant's other certifying officer and I have disclosed, based
on our most recent evaluation, to the registrant's auditors and the audit
committee of registrant's board of directors (or persons performing the
equivalent functions):

a)       all significant deficiencies in the design or operation of the internal
controls which could adversely affect the registrant's ability to record,
process, summarize and report financial data and have identified for the
registrant's auditors any material weaknesses in internal controls; and

b)       any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal controls; and

6.       The registrant's other certifying officer and I have indicated in this
quarterly report whether or not there were significant changes in internal
controls or in other factors that could significantly affect the internal
controls during the quarter ended June 30, 2003, including any corrective
actions with regard to significant deficiencies and material weaknesses.

Date:  August 11, 2003                                       /s/ Larry J. Miller
                                                             -------------------
                                                             Larry J. Miller
                                                             President and CEO