Wyo. Stat. § 15-6-435
The city or town treasurer shall pay the principal and interest on bonds issued out of the respective local improvement funds from which they are payable. If there is sufficient money in any local improvement fund over the amount required for the payment of maturing principal and interest to pay the principal of one (1) or more bonds, which are subject to redemption on the next interest payment date, the treasurer shall call in and pay those bonds in numerical order. Notice of the call shall be made by publication in a newspaper of general circulation within the city or town, or by mail to the holder, if known, not less than fifteen (15) days prior to the date of call and shall state that bonds no.....(giving the serial number or numbers of the bonds called) will be paid on the call day, and interest on those bonds shall cease upon that date.
W.S. 15-6-435