Meanwhile, Colorado's population grew by 11 percent from 2009 to 2016, to 5.55 million residents.
Colorado's median household income went up in 2016 while poverty and the number of people uninsured went down.
State demographer Elizabeth Garner still expects the state's population to rise at a slow to moderate clip in the coming years.
- Statistics show that the number of people living in Denver reached more than 682,000 in July 2015.Read more
Colorado state demographer Elizabeth Garner talks about poverty, second-home ownership, and immigrant birthrates. She talks with CPR's Jonathan Brown about December's report from the U.S.