Boone, CO has a population of 268 and is the 23,052nd largest city in the United States. The population density is 741 per sq mi which is 1389% higher than the Colorado average and 718% higher than the national average. The median age in Boone is 34 which is approximately 6% lower than the Colorado average of 36. In Boone, 45% of the population over 15 years of age are married, 90% speak English and 7% speak Spanish. 72% of Boone residents were born in Colorado, 28% were born out of state, 0% were born outside of the United States and 1% were foreign born.