Aspen, CO has a population of 6,788 and is the 5,283rd largest city in the United States. The population density is 1,750 per sq mi which is 3414% higher than the Colorado average and 1831% higher than the national average. The median age in Aspen is 43 which is approximately 18% higher than the Colorado average of 36. In Aspen, 37% of the population over 15 years of age are married, 82% speak English and 7% speak Spanish. 22% of Aspen residents were born in Colorado, 62% were born out of state, 1% were born outside of the United States and 15% were foreign born.