Colorado Population 2024 Forecast By State. Rt is an estimate on date t of the average number of new infections caused by each infectious person. The state’s population sits at 5.8 million and it’s expected to grow slowly in the next decades, reaching 7.5 million by 2050.

As of 2023, colorado’s population reached 5.88 million,. More deaths, a decline in births and a steeper drop in net migration.