Farthing (also known as Iron Mountain) was a railroad station and post office in the U.S. state of Wyoming. Farthing is located southwest of Chugwater in the Chugwater Creek valley. The region was originally named Iron Mountain due to iron deposits discovered on a nearby ridge in 1850 and briefly mined in 1870. The railroad was extended north from Cheyenne in anticipation of heavy mining development which never occurred. The railroad station was named Farthing after Charles Farthing who donated the land for the station in the early 1900s.