Colorado Population 2024 By Age. The population of colorado in 2020 was 5,785,219, a 0.46% increase from 2019. The most populous cities in colorado are denver with 716,577, colorado springs at 488,664,.

Actual and predicted population data by gender and age from the department of local affairs (dola), from 1990 to 2040. Its area is 104,094 sq miles (269,837 sq km).