Wyo. Stat. § 18-5-315: Provisions minimum.

If any board has or enacts resolutions or regulations which impose requirements on subdividers or subdivisions which are more restrictive than the provisions of this article, the authority to enact such local resolutions or regulations being hereby granted, the local provisions are not superseded by the provisions of this article. Nothing in this section shall be deemed to allow any board to impose requirements that contravene the exemptions from this article as provided in W.S. 18-5-303.