Manassa, CO has a population of 990 and is the 15,230th largest city in the United States. The population density is 1,063 per sq mi which is 2035% higher than the Colorado average and 1073% higher than the national average. The median age in Manassa is 34 which is approximately 7% lower than the Colorado average of 36. In Manassa, 59% of the population over 15 years of age are married, 75% speak English and 24% speak Spanish. 82% of Manassa residents were born in Colorado, 15% were born out of state, 0% were born outside of the United States and 3% were foreign born.