Generally a single workers compensation policy can cover multiple states. Ohio is an exception, as several people above answered. Ohio is a monopolistic state, meaning only the state government can sell you an Ohio workers compensation policy. So yes, you need a second policy.I really don't know the law well. I do know large companies in Ohio can be certified to pay workers compensation benefits directly. This amounts to being your own insurance. You may want to investigate this option. This link should help.
http://www.ohiobwc.com/employer/EmpSectionMap.asp
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