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Member Login Join Who We Are The Ohio Insurance Institute OII is a memberrun trade organization comprised of property and casualty insurance companies and related organizations throughout the state of Ohio. Our members include leading domestic regional and national PC insurance companies trade groups and related organizations. Our mission To act as the Ohio property and casualty insurance industrys voice on matters affecting or involving the industry. About the OII Directory Meet the Team Join Insurance in Ohio Ohios insurance industry is a key economic driver of our states economy.