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 and year ended September 30, 2007. The Fund�s fiscal year ended on September 30, 2007. For the three months ended September 30, 2007, the Fund had net investment income of $619,941 ($0.246 per common share). From this amount, the Fund paid dividends on preferred shares of $198,946 equal to $0.079 for each common share), resulting in net investment income after the preferred dividends of $420,995, or $0.167 per common share. The Fund�s net investment income for the year ended September 30, 2007 was $2,428,283 ($0.966 per common share, before deduction of the preferred share dividends totaling $0.301 per common share), resulting in net investment income after the preferred dividends of $0.665 per common share. In comparison, for the three months ended September 30, 2006, the Fund had net investment income of $617,542 ($0.246 per common share). From this amount, the Fund paid dividends on preferred shares of $181,624 equal to $0.072 for each common share), resulting in net investment income after the preferred dividends of $435,918, or $0.174 per common share. The Fund�s net investment income for the year ended September 30, 2006 was $2,456,473 ($0.978 per common share, before deduction of the preferred share dividends totaling $0.263 per common share), resulting in net investment income after the preferred dividends of $0.715 per common share. Net realized and unrealized losses for the three months ended September 30, 2007 were $2,079 ($0.000 per common share). Net realized and unrealized losses for the year ended September 30, 2007 were 919,318 ($0.361 per common share). In comparison, net realized and unrealized gains for the three months ended September 30, 2006 were $1,689,009 ($0.664 per common share). The Fund�s net realized and unrealized gains for the year ended September 30, 2006 were $1,270,308 ($0.497 per common share). On September 30, 2007, net assets of the Fund applicable to common shares were $37,616,917. The net asset value per common share on September 30, 2007 was $14.97 based on 2,512,913 common shares outstanding. In comparison, on September 30, 2006, net assets of the Fund applicable to common shares were $38,531,570. The net asset value per common share on September 30, 2006 was $15.33 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 over $161.7 billion in assets under management as of October 31, 2007. Eaton Vance Management will make available periodic summary information regarding portfolio investments. Those interested should call Eaton Vance 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 Year Ended � September 30, � � September 30, � � 2007 � � 2006 � � 2007 � � 2006 � Net investment income $ 620 $ 618 $ 2,428 $ 2,456 Net realized and unrealized gains (losses) on investments (2 ) 1,689 (919 ) 1,270 Preferred dividend paid from net investment income � (199 ) � (182 ) � (757 ) � (660 ) Net increase (decrease) in net assets from operations $ 419 � $ 2,125 � $ 752 � $ 3,066 � � Earnings per Share Outstanding Net investment income $ 0.246 $ 0.246 $ 0.966 $ 0.978 Net realized and unrealized gains (losses) on investments $ - 0.664 (0.361 ) 0.497 Preferred dividend paid from net investment income � (0.079 ) � (0.072 ) � (0.301 ) � (0.263 ) Net increase (decrease) in net assets from operations $ 0.167 � $ 0.838 � $ 0.304 � $ 1.212 � � Net investment income $ 0.246 $ 0.246 $ 0.966 $ 0.978 Preferred dividend paid from net investment income � (0.079 ) � (0.072 ) � (0.301 ) � (0.263 ) Net investment income after preferred dividend $ 0.167 � $ 0.174 � $ 0.665 � $ 0.715 � � Net Asset Value at September 30 (Common Shares) Net assets $ 37,617 $ 38,532 Shares outstanding 2,513 2,513 Net asset value per share outstanding $ 14.97 $ 15.33 � Market Value Summary (Common Shares) Market price on AMEX at September 30 $ 13.71 $ 14.60 High market price (year ended September 30) 15.75 15.00 Low market price (year ended September 30) $ 13.14 $ 13.71