Wyo. Stat. § 2-12-101
Whenever any resident of this state who owns or is entitled to the possession of any real or personal property situate therein is missing, or his whereabouts is unknown for ninety (90) days, and a verified petition is presented to the court of the county of which the missing person is a resident representing that the whereabouts of the missing person has been for such time and still is unknown, that his estate requires attention, supervision and care of ownership, and setting forth the names, ages and residence of the relatives of the missing person who would be heirs at law were the missing person deceased, the court shall order the petition to be filed and appoint a day for hearing the petition not less than ten (10) days from the date of the order.
W.S. 2-12-101