EIO Eaton Vance Ohio Municipal Bond Fund Common Shared of Befeficial Interest, $.01 Par Value

Eaton Vance Insured Ohio Municipal Bond Fund (AMEX:EIO) (the "Fund"), a closed-end investment company, today announced the earnings of the Fund for the three and nine-months periods ended June 30, 2006. The Fund's fiscal year ends on September 30, 2006. For the three months ended June 30, 2006, the Fund had net investment income of $608,943 ($0.242 per common share). From this amount, the Fund paid dividends on preferred shares of $179,382 equal to $0.072 for each common share), resulting in net investment income after the preferred dividends of $429,561, or $0.170 per common share. The Fund's net investment income for the nine months ended June 30, 2006 was $1,838,931 ($0.732 per common share, before deduction of the preferred share dividends totaling $0.191 per common share), resulting in net investment income after the preferred dividends of $0.541 per common share. In comparison, for the three months ended June 30, 2005, the Fund had net investment income of $622,842 ($0.248 per common share). From this amount, the Fund paid dividends on preferred shares of $130,590 (equal to $0.052 for each common share), resulting in net investment income after the preferred dividends of $492,252, or $0.196 per common share. The Fund's net investment income for the nine months ended June 30, 2005 was $1,905,417 ($0.759 per common share, before deduction of the preferred share dividends totaling $0.124 per common share), resulting in net investment income after the preferred dividends of $0.635 per common share. Net realized and unrealized losses for the three months ended June 30, 2006 were $777,996 ($0.302 per common share). The Fund's net realized and unrealized losses for the nine months ended June 30, 2006 were $418,701 ($0.167 per common share). In comparison, net realized and unrealized gains for the three months ended June 30, 2005 were $1,014,426 ($0.394 per common share). The Fund's net realized and unrealized gains for the nine months ended June 30, 2005 were $1,043,744 ($0.416 per common share). On June 30, 2006, net assets of the Fund applicable to common shares were $36,828,783. The net asset value per common share on June 30, 2006 was $14.66 based on 2,512,727 common shares outstanding. In comparison, on June 30, 2005, net assets of the Fund applicable to common shares were $37,725,304. The net asset value per common share on June 30, 2005 was $15.02 based on 2,512,182 common shares outstanding. Common shares of the Fund are traded on the American Stock Exchange. The Fund is managed by Eaton Vance Management, a subsidiary of Eaton Vance Corp, which is listed on the New York Stock Exchange under the symbol EV. Eaton Vance and its affiliates had approximately $120.4 billion in assets under management on July 31, 2006. Eaton Vance Management will make available periodic summary information regarding portfolio investments. Those interested should call Eaton Vance at (800) 262-1122. -0- *T EATON VANCE INSURED OHIO MUNICIPAL BOND FUND SUMMARY OF RESULTS OF OPERATIONS (in thousands, except per share amounts) Three Months Ended Nine Months Ended June 30, June 30, ------------------- ----------------- 2006 2005 2006 2005 ---------- -------- -------- -------- Gross investment income $718 $729 $2,160 $2,226 Operating expenses ($109) ($106) ($321) ($321) ---------- -------- -------- -------- Net investment income $609 $623 $1,839 $1,905 Net realized and unrealized gains (losses) on investments ($778) $1,014 ($419) $1,044 Preferred dividend paid from net investment income ($179) ($131) ($479) ($311) Net increase (decrease) in net assets from operations ($348) $1,506 $941 $2,638 ========== ======== ======== ======== Earnings per Share Outstanding --------------------------------- Gross investment income $0.286 $0.290 $0.860 $0.887 Operating expenses ($0.044) ($0.042) ($0.128) ($0.128) ---------- -------- -------- -------- Net investment income $0.242 $0.248 $0.732 $0.759 Net realized and unrealized gains (losses) on investments ($0.302) $0.394 ($0.167) $0.416 Preferred dividend paid from net investment income ($0.072) ($0.052) ($0.191) ($0.124) ---------- -------- -------- -------- Net increase (decrease) in net assets from operations ($0.132) $0.590 $0.374 $1.051 ========== ======== ======== ======== Net investment income $0.242 $0.248 $0.732 $0.759 Preferred dividend paid from net investment income ($0.072) ($0.052) ($0.191) ($0.124) ---------- -------- -------- -------- Net investment income after preferred dividend $0.170 $0.196 $0.541 $0.635 ========== ======== ======== ======== Net Asset Value at June 30, (Common Shares) --------------------------------- Net assets (000) $36,829 $37,725 Shares outstanding (000) 2,513 2,512 Net asset value per share outstanding $14.66 $15.02 Market Value Summary (Common Shares) --------------------------------- Market price on AMEX at June 30 $14.20 $16.20 High market price (six months ended June 30) $15.00 $16.60 Low market price (six months ended June 30) $13.71 $14.75 *T