The number of monopolistic state funds have dwindled due to states such as Nevada and West Virginia converting to a free market system. In a monopolistic state for Workers Compensation the law requires that companies in that state purchase workers compensation coverage from the government. Private insurers cannot write policies in these states.

North Dakota, Ohio, Washington, and Wyoming are the last of the monopolistic state funds in existence. Monopolistic state funds are not to be confused with competitive state funds such as SCIF in CA.