Fort Lupton, CO has a population of 7,814 and is the 4,786th largest city in the United States. The population density is 748 per sq mi which is 1402% higher than the Colorado average and 726% higher than the national average. The median age in Fort Lupton is 34 which is approximately 6% lower than the Colorado average of 36. In Fort Lupton, 60% of the population over 15 years of age are married, 67% speak English and 33% speak Spanish. 55% of Fort Lupton residents were born in Colorado, 28% were born out of state, 2% were born outside of the United States and 15% were foreign born.