Silverthorne, CO has a population of 4,206 and is the 7,216th largest city in the United States. The population density is 1,046 per sq mi which is 2000% higher than the Colorado average and 1054% higher than the national average. The median age in Silverthorne is 38 which is approximately 5% higher than the Colorado average of 36. In Silverthorne, 67% of the population over 15 years of age are married, 66% speak English and 27% speak Spanish. 36% of Silverthorne residents were born in Colorado, 36% were born out of state, 1% were born outside of the United States and 27% were foreign born.