Collbran, CO has a population of 666 and is the 17,770th largest city in the United States. The population density is 1,128 per sq mi which is 2165% higher than the Colorado average and 1145% higher than the national average. The median age in Collbran is 21 which is approximately 43% lower than the Colorado average of 36. In Collbran, 35% of the population over 15 years of age are married, 90% speak English and 7% speak Spanish. 51% of Collbran residents were born in Colorado, 45% were born out of state, 0% were born outside of the United States and 4% were foreign born.