Colorado mayors are ready for a legal fight to assert local control in a clash over state legislation backed by Gov. Jared Polis that would allow more high-density development near transit.

Colorado’s population grew by nearly 15 percent between 2010 and 2020, according to U.S. Census Bureau data released Thursday. That brought Colorado's population from 5 million in 2010 to about ...

Colorado's population topped 5.6 million in 2017, according to U.S. Census Bureau estimates released today. The state added 77,049 residents, growing 1.4 percent from 2016, for a total population ...

While Colorado's recent boom may feel unprecedented, the state grew at roughly twice the same rate in the 1990s. But back then, the state's population was around 3.5 million.