Wyo. Stat. § 18-5-203
It is unlawful to locate, erect, construct, reconstruct, enlarge, change, maintain or use any building or use any land within any area included in a zoning resolution without first obtaining a zoning certificate from the board of county commissioners or its designee and no zoning certificate shall be issued unless the plans for the proposed building, structure or use fully comply with the zoning regulations then in effect. The board of county commissioners or its designee shall act promptly upon any application filed with it and shall grant certificates when the proposed construction or use complies with the requirements of the zoning resolution. If it denies the application, the board or its designee shall specify the reasons for the denial. Any applicant desiring to appeal shall appeal to the board of county commissioners. The decision of the board of county commissioners may be reviewed by the district court and by the supreme court upon appeal in the same manner as provided in W.S. 15-1-609, for review of decisions of boards of adjustment.
W.S. 18-5-203