<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance California Municipal Income Trust (the
"Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance Florida Municipal Income Trust (the
"Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance Massachusetts Municipal Income Trust
(the "Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of EATON VANCE MICHIGAN MUNICIPAL INCOME FUND
(the "Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
-------------
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
-------------
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance New Jersy Municipal Income Trust
(the "Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance New York Municipal Income Trust
(the "Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of Eaton Vance Ohio Municipal Income Trust (the
"Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
/s/ James L. O'Connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President
<Page>
FORM N-CSR ITEM 10(b) EXHIBIT
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
The undersigned hereby certify in their capacity as Treasurer and
President, respectively, of EATON VANCE PENNSYLVANIA MUNICIPAL INCOME FUND (the
"Fund"), that:
(a) the Semi-Annual Report of the Fund on Form N-CSR for the period ended
May 31, 2003 (the "Report") fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as
amended; and
(b) the information contained in the Report fairly presents, in all material
respects, the financial condition and the results of operations of the
Fund for such period.
A SIGNED ORIGINAL OF THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED TO THE FUND AND WILL BE RETAINED BY THE FUND AND FURNISHED TO THE
SECURITIES AND EXCHANGE COMMISSION OR ITS STAFF UPON REQUEST.
Date: July 16, 2003
-------------
/s/ James L. O'connor
- ---------------------
James L. O'Connor
Treasurer
Date: July 16, 2003
-------------
/s/ Thomas J. Fetter
- --------------------
Thomas J. Fetter
President