15-1-412. When written consent of landowners required for annexation; exception. No tract of land or any part thereof, whether consisting of one (1) parcel or two (2) or more contiguous parcels owned by one (1) landowner or owned jointly by two (2) or more landowners as cotenants, which comprises forty (40) acres or more and which together with the buildings or improvements situated thereon has an assessed valuation in excess of forty thousand dollars ($40,000.00) as of the current assessment for property tax purposes, may be annexed without the written consent of the landowner or landowners, unless the tract of land is situated entirely within the boundaries of the annexing city or town.
Wyoming Legal Code