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�), closed-end management investment company, today announced the earnings of the Fund for the three months ended December 31, 2006. The Fund�s fiscal year ends on September 30, 2007. For the three months ended December 31, 2006, the Fund had net investment income of $607,810 ($0.242 per common share). From this amount, the Fund paid dividends on preferred shares of $184,559 (equal to $0.073 for each common share), resulting in net investment income after the preferred dividends of $423,251, or $0.169 per common share. In comparison, for the three months ended December 31, 2005, the Fund had net investment income of $615,832 ($0.245 per common share). From this amount, the Fund paid dividends on preferred shares of $141,755 (equal to $0.056 for each common share), resulting in net investment income after the preferred dividends of $474,077, or $0.189 per common share. Net realized and unrealized gains for the three months ended December 31, 2006 were $522,543 ($0.208 per common share). Net realized and unrealized losses for the three months ended December 31, 2005 were $140,326 ($0.056 per common share). On December 31, 2006, net assets of the Fund applicable to common shares were $39,055,225. The net asset value per common share on December 31, 2006 was $15.54 based on 2,512,727 common shares outstanding. In comparison, on December 31, 2005, net assets of the Fund applicable to common shares were $37,128,665. The net asset value per common share on December 31, 2005 was $14.78 based on 2,512,727 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 $135.5 billion in assets under management on January 31, 2007. Eaton Vance Management will make available periodic summary information regarding portfolio investments. Those interested should call Eaton Vance at (617) 482-8260. EATON VANCE INSURED OHIO MUNICIPAL BOND FUND SUMMARY OF RESULTS OF OPERATIONS (in thousands, except per share amounts) � Three Months Ended Three Months Ended � December 31, � December 31, 2006� 2005� Net investment income $608� $616� Net realized and unrealized gains (losses) on investments $523� ($140) Preferred dividends paid from net investment income ($185) ($142) Net increase (decrease) in net assets from operations $946� $334� � Earnings per Common Share Outstanding Net investment income $0.242� $0.245� Net realized and unrealized gains (losses) on investments $0.208� ($0.056) Preferred dividends paid from net investment income ($0.073) ($0.056) Net increase (decrease) in net assets from operations $0.377� $0.133� � Net investment income $0.242� $0.245� Preferred dividends paid from net investment income (0.073) (0.056) Net investment income after preferred dividends $0.169� $0.189� � Net Asset Value at December 31 Net assets (000) $39,055� $37,129� Shares outstanding (000) 2,513� 2,513� Net asset value per share outstanding $15.54� $14.78� � Market Value Summary (Common Shares) Market price on AMEX at December 31 $14.72� $13.88� High market price (period ended December 31) $14.92� $14.56� Low market price (period ended December 31) $14.32� $13.71�