Aerial view of Stanley, Idaho, United States – Sam Beebe, CC BY 2.0 – Wikimedia Commons Stanley is located in Custer County. The region is located on the body of water Salmon River. About 116 people live here (as of 2020). Between 2010 and 2020, the population grew from 63 to 116. The region is at 1906 meters above sea level. The area covers about 1.4 square kilometers. There are about 29 streets in Stanley. The postal codes are 83278. The dialing code is 208. Stanley is city in Custer County, Idaho, United States. Among other things, Stanley has hotels, restaurants and clothing Stores. More information at www.stanley.id.gov.