Colorado is now the second-fastest growing state growth trend began four years before added 100,986 people between 2014 and 2015 growing Colorado is the second-fastest growing state in the U.S. one of the fastest-growing states Colorado is now the second-fastest growing state 5,300,000 people the second-fastest growing state Learn More second fastest growing state in the nation 17% population increase over the next 26 years second fastest growing state Denver Post Colorado is the second-fastest growing state in the U.S. growth trend began four years before Colorado is now the second-fastest growing state Colorado is now the second-fastest growing state the second fastest growing state Denver Post 17% population increase over the next 26 years 9,000 residents per month in recent years. 17% population increase over the next 26 years Colorado is the second-fastest growing state in the U.S. 17% population increase over the next 26 years one of the fastest-growing states Colorado is now the second-fastest growing state Denver Post on Colorado Population Boom Denver Post on Colorado Population Boom 17% population increase over the next 26 years rose by nearly 5 percent 2nd fastest growing state second-fastest growing state second fastest growing state