Wyo. Stat. § 15-1-511
Subject to appropriate eminent domain proceedings, if anyone transfers or sells any land located within any area for which a major street plan has been adopted by the commission and the governing body, except for land located in a recorded subdivision, without first preparing a subdivision plat and having it approved by the commission and governing body and recorded in the office of the county clerk, he shall pay a penalty of one hundred dollars ($100.00) for each lot transferred or sold. The description by metes and bounds in the instrument of transfer or other document used in the process of selling or transferring does not exempt the transaction from such penalties. The municipality may enjoin the transfer or sale or may recover the penalty by civil action.
W.S. 15-1-511