EX-99. CERT

                      CERTIFICATION PURSUANT TO SECTION 302
                        OF THE SARBANES-OXLEY ACT OF 2002

- --------------------------------------------------------------------------------

      I, Terry K. Glenn, President of MuniYield New Jersey Fund, Inc., certify
      that:

            1.    I have reviewed this report on Form N-CSR of MuniYield New
                  Jersey Fund, Inc. (the "Fund");

            2.    Based on my knowledge, this 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 report;

            3.    Based on my knowledge, the financial statements, and other
                  financial information included in this report, fairly present
                  in all material respects the financial condition, results of
                  operations, changes in net assets, and cash flows (if the
                  financial statements are required to include a statement of
                  cash flows) of the Fund as of, and for, the periods presented
                  in this report;

            4.    The Fund's other certifying officer(s) and I are responsible
                  for establishing and maintaining disclosure controls and
                  procedures (as defined in Rule 30a-3(c) under the Investment
                  Company Act of 1940) and internal control over financial
                  reporting (as defined in Rule 30a-3(d) under the Investment
                  Company Act of 1940) for the Fund 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 Fund, including its
                        consolidated subsidiaries, is made known to us by others
                        within those entities, particularly during the period in
                        which this report is being prepared;

                  b)    evaluated the effectiveness of the Fund's disclosure
                        controls and procedures and presented in this report our
                        conclusions about the effectiveness of the disclosure
                        controls and procedures, as of a date within 90 days
                        prior to the filing date of this report based on such
                        evaluation; and



                  c)    disclosed in this report any change in the Fund's
                        internal control over financial reporting that occurred
                        during the Fund's most recent fiscal half-year (the
                        Fund's second fiscal half-year in the case of an annual
                        report) that has materially affected, or is reasonably
                        likely to materially affect, the Fund's internal control
                        over financial reporting; and

            5.    The Fund's other certifying officer(s) and I have disclosed to
                  the Fund's auditors and the audit committee of the Fund's
                  board of directors (or persons performing the equivalent
                  functions):

                  a)    all significant deficiencies and material weaknesses in
                        the design or operation of internal control over
                        financial reporting which are reasonably likely to
                        adversely affect the Fund'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 Fund's internal control over financial
                        reporting.

      Date: July 19, 2004


                                               /s/ Terry K. Glenn
                                               ------------------
                                               Terry K. Glenn,
                                               President of MuniYield New Jersey
                                               Fund, Inc.



EX-99. CERT

                      CERTIFICATION PURSUANT TO SECTION 302
                        OF THE SARBANES-OXLEY ACT OF 2002

- --------------------------------------------------------------------------------

      I, Donald C. Burke, Chief Financial Officer of MuniYield New Jersey Fund,
      Inc., certify that:

            1.    I have reviewed this report on Form N-CSR of MuniYield New
                  Jersey Fund, Inc. (the "Fund");

            2.    Based on my knowledge, this 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 report;

            3.    Based on my knowledge, the financial statements, and other
                  financial information included in this report, fairly present
                  in all material respects the financial condition, results of
                  operations, changes in net assets, and cash flows (if the
                  financial statements are required to include a statement of
                  cash flows) of the Fund as of, and for, the periods presented
                  in this report;

            4.    The Fund's other certifying officer(s) and I are responsible
                  for establishing and maintaining disclosure controls and
                  procedures (as defined in Rule 30a-3(c) under the Investment
                  Company Act of 1940) and internal control over financial
                  reporting (as defined in Rule 30a-3(d) under the Investment
                  Company Act of 1940) for the Fund 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 Fund, including its
                        consolidated subsidiaries, is made known to us by others
                        within those entities, particularly during the period in
                        which this report is being prepared;

                  b)    evaluated the effectiveness of the Fund's disclosure
                        controls and procedures and presented in this report our
                        conclusions about the effectiveness of the disclosure
                        controls and procedures, as of a date within 90 days
                        prior to the filing date of this report based on such
                        evaluation; and



                  c)    disclosed in this report any change in the Fund's
                        internal control over financial reporting that occurred
                        during the Fund's most recent fiscal half-year (the
                        Fund's second fiscal half-year in the case of an annual
                        report) that has materially affected, or is reasonably
                        likely to materially affect, the Fund's internal control
                        over financial reporting; and

            5.    The Fund's other certifying officer(s) and I have disclosed to
                  the Fund's auditors and the audit committee of the Fund's
                  board of directors (or persons performing the equivalent
                  functions):

                        a)    all significant deficiencies and material
                              weaknesses in the design or operation of internal
                              control over financial reporting which are
                              reasonably likely to adversely affect the Fund'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 Fund's internal control
                              over financial reporting.

      Date: July 19, 2004


                                               /s/ Donald C. Burke
                                               -------------------
                                               Donald C. Burke,
                                               Chief Financial Officer of
                                               MuniYield New Jersey Fund, Inc.