Carbondale, CO has a population of 6,571 and is the 5,419th largest city in the United States. The population density is 3,165 per sq mi which is 6256% higher than the Colorado average and 3393% higher than the national average. The median age in Carbondale is 33 which is approximately 8% lower than the Colorado average of 36. In Carbondale, 60% of the population over 15 years of age are married, 60% speak English and 37% speak Spanish. 36% of Carbondale residents were born in Colorado, 39% were born out of state, 2% were born outside of the United States and 22% were foreign born.