Wyo. Stat. § 35-1-303: Rules and regulations; jurisdiction.

(a) County and/or city and district boards of health may enact rules and regulations pertaining to the prevention of disease and the promotion of public health in the area over which such respective boards have jurisdiction. But in no instance shall such rules and regulations be less effective than, or in conflict with, rules and regulations promulgated by the state department of health. The district and/or city health officers shall have all powers vested by law in county health officers.

(b) The jurisdiction of the county and/or city or district health department shall extend over all unincorporated areas and over all municipalities within the territorial limits of the county or counties comprising the district except municipalities of Class I may maintain their own health departments. However, any municipalities of Class I may merge its health services with that of the county or district in which such city is located.