Wyo. Stat. § 15-1-1002: Census; when taken; affidavit.

In order to determine whether its resident corporate population is thirty-five (35) persons or less, the governing body or the persons of the last governing body shall cause an accurate census to be taken of the resident population of the city or town on some day not more than forty (40) days prior to the date of passage of the resolution to dissolve its municipal corporate status. The census shall name every head of a family residing within the municipality on that day and the number of persons then belonging to every family. The person or persons taking the census shall verify it by affidavit.