Metaline is a town in Pend Oreille County, Washington, United States. Take a look below for 10 amazing and fascinating facts about Metaline, Washington, United States. 1. The population was 173 at the 2010 census. 2. The Pend Oreille River was deepened at Box Canyon in 1906, allowing navigation to Metaline. 3. The Metaline Mine…