Company Information Company History: West American Insurance Company is a property and casualty insurance company licensed in Indiana that is part of the Ohio Casualty group of insurance companies. West American traces its beginnings to a California company founded in 1923. The license was moved to Indiana in 1995 and the current name was adopted then. The administrative offices are in Fairfield, Ohio, the location of Ohio Casualty's headquarters. Ohio Casualty Corp. is the publicly traded holding company for the 6 companies that make up t ...