(Undated) -- Iowa is one of the worst states in the country for natural disasters. WalletHub says Iowa ranks 4th for natural disasters based on two key factors, number of disasters that've caused at least $1-billion in damage since 1980 and loss amounts per capita. Iowa ranks 5th overall in the second category. WalletHub says the state most impacted by natural disasters is Mississippi and the least impacted state is Maine. A full list of states is available here.