Wyo. Stat. § 18-3-806
Each county treasurer shall keep a true account of the receipts and expenditure of all monies which come into his office in a book or books kept by him for that purpose. The books shall be available at all times for inspection by the board of county commissioners or any member thereof, county and state officers or any citizen. At the annual meeting of the board of county commissioners on the first Monday in January of each year or at such other time as they may direct, the county treasurer shall settle with them his account for the preceding year, and shall exhibit to them all his books, accounts and vouchers to be audited and allowed. He shall also report at each regular meeting of the board of county commissioners of the amount of monies received and expended by him during the intervening time, if so required.
W.S. 18-3-806