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 management investment company, today announced the earnings of the Fund for the three months ended December 31, 2007. The Fund�s fiscal year ends on September 30, 2008. For the three months ended December 31, 2007, the Fund had net investment income of $600,047 ($0.239 per common share). From this amount, the Fund paid dividends on preferred shares of $196,659 (equal to $0.078 for each common share), resulting in net investment income after the preferred dividends of $403,388, or $0.161 per common share. In comparison, 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. Net realized and unrealized losses for the three months ended December 31, 2007 were $1,092,019 ($0.435 per common share). In comparison, net realized and unrealized gains for the three months ended December 31, 2006 were $522,543 ($0.208 per common share). On December 31, 2007, net assets of the Fund applicable to common shares were $36,537,530. The net asset value per common share on December 31, 2007 was $14.54 based on 2,512,913 common shares outstanding. In comparison, 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. 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 $152.9 billion in assets under management on January 31, 2008. Eaton Vance Management will make available periodic summary information regarding portfolio investments. Those interested should call Eaton Vance Management at (800) 262-1122. 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, 2007 2006 Net investment income $ 600 $ 608 Net realized and unrealized gains (losses) on investments (1,092 ) 523 Preferred dividends paid from net investment income � (197 ) � (185 ) Net increase (decrease) in net assets from operations $ (689 ) $ 946 � � Earnings per Common Share Outstanding Net investment income $ 0.239 $ 0.242 Net realized and unrealized gains (losses) on investments (0.435 ) 0.208 Preferred dividends paid from net investment income � (0.078 ) � (0.073 ) Net increase (decrease) in net assets from operations $ (0.274 ) $ 0.377 � � Net investment income $ 0.239 $ 0.242 Preferred dividends paid from net investment income � (0.078 ) � (0.073 ) Net investment income after preferred dividends $ 0.161 � $ 0.169 � � Net Asset Value at December 31 Net assets (000) $ 36,538 $ 39,055 Shares outstanding (000) 2,513 2,513 Net asset value per share outstanding $ 14.54 $ 15.54 � Market Value Summary (Common Shares) Market price on AMEX at December 31 $ 13.11 $ 14.72 High market price (period ended December 31) $ 13.99 $ 14.92 Low market price (period ended December 31) $ 12.56 $ 14.32