Federal Heights, CO has a population of 12,173 and is the 3,379th largest city in the United States. The population density is 6,855 per sq mi which is 13668% higher than the Colorado average and 7466% higher than the national average. The median age in Federal Heights is 33 which is approximately 10% lower than the Colorado average of 36. In Federal Heights, 49% of the population over 15 years of age are married, 54% speak English and 42% speak Spanish. 47% of Federal Heights residents were born in Colorado, 27% were born out of state, 1% were born outside of the United States and 24% were foreign born.