Walden, CO has a population of 481 and is the 19,765th largest city in the United States. The population density is 1,435 per sq mi which is 2782% higher than the Colorado average and 1484% higher than the national average. The median age in Walden is 51 which is approximately 40% higher than the Colorado average of 36. In Walden, 71% of the population over 15 years of age are married, 95% speak English and 5% speak Spanish. 60% of Walden residents were born in Colorado, 35% were born out of state, 0% were born outside of the United States and 5% were foreign born.