Idaho Springs, CO has a population of 1,937 and is the 11,201st largest city in the United States. The population density is 885 per sq mi which is 1677% higher than the Colorado average and 876% higher than the national average. The median age in Idaho Springs is 44 which is approximately 21% higher than the Colorado average of 36. In Idaho Springs, 46% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 46% of Idaho Springs residents were born in Colorado, 49% were born out of state, 1% were born outside of the United States and 4% were foreign born.