What is the population of Colorado?

The state population was 4,301,261 as of the 2000 census.
The State Demography Office for the state of Colorado also makes estimates of future populations. For 2008, the state estimate was 5,010,395.
For 2009, the state estimate was 5,109,700.
The 2010 Census recorded 5,029,196 residents in Colorado.