Exhibit 31.1

                                 CERTIFICATIONS

I, Marshall M. Sloane, certify that:

      1. I have reviewed this quarterly report on Form 10-Q of Century 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 period 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-15 (e) and 15d-15 (e)) and internal
      control over financial reporting (as defined in Exchange Act Rules
      13a-15(f) and 15d-15(f)) for the registrant, and have:

            (a) Designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, 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 and presented in this report our conclusions
            about the effectiveness of the disclosure controls and procedures,
            as of the end of the period covered by this report based on such
            evaluation; and;

            (c) Disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal quarter that has materially
            affected, or is reasonably likely to materially affect, the
            registrant's internal control over financial reporting; and

      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;

            (a) all significant deficiencies and material weaknesses in the
            design or operation of internal controls over financial reporting
            which are reasonably likely to adversely affect the registrant's
            ability to record, process, summarize and report financial
            information; 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 over financial reporting.

Date: May 7, 2004                                 /s/ Marshall M. Sloane
                                                  ------------------------------
                                                  Marshall M. Sloane
                                                  Chairman, President and CEO
                                                  (Principal Executive Officer)