Commerce City, CO has a population of 51,731 and is the 785th largest city in the United States. The population density is 1,459 per sq mi which is 2830% higher than the Colorado average and 1510% higher than the national average. The median age in Commerce City is 31 which is approximately 15% lower than the Colorado average of 36. In Commerce City, 58% of the population over 15 years of age are married, 67% speak English and 29% speak Spanish. 57% of Commerce City residents were born in Colorado, 28% were born out of state, 1% were born outside of the United States and 14% were foreign born.