Basalt, CO has a population of 3,783 and is the 7,702nd largest city in the United States. The population density is 1,892 per sq mi which is 3701% higher than the Colorado average and 1989% higher than the national average. The median age in Basalt is 44 which is approximately 20% higher than the Colorado average of 36. In Basalt, 51% of the population over 15 years of age are married, 82% speak English and 17% speak Spanish. 27% of Basalt residents were born in Colorado, 61% were born out of state, 1% were born outside of the United States and 11% were foreign born.