Northglenn, CO has a population of 38,128 and is the 1,089th largest city in the United States. The population density is 5,187 per sq mi which is 10318% higher than the Colorado average and 5625% higher than the national average. The median age in Northglenn is 34 which is approximately 6% lower than the Colorado average of 36. In Northglenn, 52% of the population over 15 years of age are married, 82% speak English and 13% speak Spanish. 53% of Northglenn residents were born in Colorado, 36% were born out of state, 1% were born outside of the United States and 10% were foreign born.