EX-99. CERT


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


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

1. I have reviewed this report on Form N-CSR of MuniYield New Jersey
Insured 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; and

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 officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940)
for the Fund and have:

a) designed such disclosure controls and procedures 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 as of a date within 90 days prior to the filing date of
this report (the "Evaluation Date"); and

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

5. The Fund's other certifying officers and I have disclosed, based
on our most recent evaluation, 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 in the design or operation of
internal controls which could adversely affect the Fund's ability to
record, process, summarize, and report financial data and have
identified for the Fund'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 Fund's internal
controls; and

6. The Fund's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal
controls or in other factors that could significantly affect
internal controls subsequent to the date of our most recent
evaluation, including any corrective actions with regard to
significant deficiencies and material weaknesses.


Date: June 23, 2003


       /s/ Terry K. Glenn
       Terry K. Glenn,
       President of
       MuniYield New Jersey Insured 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
Insured Fund, Inc., certify that:

1. I have reviewed this report on Form N-CSR of MuniYield New Jersey
Insured 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 officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940)
for the Fund and have:

a) designed such disclosure controls and procedures 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 as of a date within 90 days prior to the filing date of
this report (the "Evaluation Date"); and

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

5. The Fund's other certifying officers and I have disclosed, based
on our most recent evaluation, 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 in the design or operation of
internal controls which could adversely affect the Fund's ability to
record, process, summarize, and report financial data and have
identified for the Fund'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 Fund's internal
controls; and

6. The Fund's other certifying officers and I have indicated in this
report whether or not there were significant changes in internal
controls or in other factors that could significantly affect
internal controls subsequent to the date of our most recent
evaluation, including any corrective actions with regard to
significant deficiencies and material weaknesses.


Date: June 23, 2003


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




Exhibit 99.1350CERT


Certification Pursuant to Section 906 of the Sarbanes Oxley Act


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

1. The N-CSR of the Fund (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 results of operations
of the Fund.


Dated: June 23, 2003


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


A signed original of this written statement required by Section 906
has been provided to MuniYield New Jersey Fund, Inc. and will be
retained by MuniYield New Jersey Fund, Inc. and furnished to the
Securities and Exchange Commission or staff upon request.




Exhibit 99.1350CERT


Certification Pursuant to Section 906 of the Sarbanes Oxley Act


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

1. The N-CSR of the Fund (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 results of operations
of the Fund.


Dated: June 23, 2003


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


A signed original of this written statement required by Section 906
has been provided to MuniYield New Jersey Fund, Inc. and will be
retained by MuniYield New Jersey Fund, Inc. and furnished to the
Securities and Exchange Commission or staff upon request.