Wyo. Stat. § 37-2-216: Venue.

All provisions of the law of this state relating to venue shall apply to proceedings under this act, and in addition any action at law or in equity to enforce the provisions of this act, or of any order of the commission, or to prevent any proposed violation thereof, may be commenced in the district court in and for the county in which the principal office of the commission is located or in the county where the principal office in the state of the public utility is located.