Leadville, CO has a population of 2,614 and is the 9,575th largest city in the United States. The population density is 2,370 per sq mi which is 4660% higher than the Colorado average and 2516% higher than the national average. The median age in Leadville is 39 which is approximately 8% higher than the Colorado average of 36. In Leadville, 50% of the population over 15 years of age are married, 78% speak English and 11% speak Spanish. 38% of Leadville residents were born in Colorado, 49% were born out of state, 6% were born outside of the United States and 7% were foreign born.