Smelterville, ID has a population of 680 and is the 17,658th largest city in the United States. The population density is 2,226 per sq mi which is 11566% higher than the Idaho average and 2357% higher than the national average. The median age in Smelterville is 43 which is approximately 21% higher than the Idaho average of 36. In Smelterville, 59% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 48% of Smelterville residents were born in Idaho, 51% were born out of state, 0% were born outside of the United States and 1% were foreign born.