Highlands Ranch, CO has a population of 106,596 and is the 280th largest city in the United States. The population density is 4,392 per sq mi which is 7743% higher than the Colorado average and 4748% higher than the national average. The median age in Highlands Ranch is 38 which is approximately 4% higher than the Colorado average of 36. In Highlands Ranch, 69% of the population over 15 years of age are married, 89% speak English and 3% speak Spanish. 37% of Highlands Ranch residents were born in Colorado, 53% were born out of state, 1% were born outside of the United States and 9% were foreign born.