Wyo. Stat. Ann. § 15-3-103

No right of property accrued to any city or town, corporation or person under any law previously in force is affected by a city or town becoming a first class city. All ordinances not in conflict with this chapter shall continue in force until amended or repealed by the governing body. Any city or town becoming a first class city retains all its trusts, rights, privileges and indebtedness. All actions commenced by or against any city or town which becomes a first class city shall be continued to final judgment and satisfaction as if its status had not changed.