Centennial, CO has a population of 107,862 and is the 278th largest city in the United States. The population density is 3,647 per sq mi which is 7224% higher than the Colorado average and 3925% higher than the national average. The median age in Centennial is 41 which is approximately 13% higher than the Colorado average of 36. In Centennial, 65% of the population over 15 years of age are married, 89% speak English and 4% speak Spanish. 39% of Centennial residents were born in Colorado, 50% were born out of state, 2% were born outside of the United States and 9% were foreign born.