SmartAsset researched U.S. Census Bureau data from 2017 to see where Millennials are moving to and from. Colorado was the 3rd most popular state for Millennials moving to with a net migration of 26,547 people last year. The City of Denver saw a net influx of Millennials of 5,100 last year, good for 8th best in the country. Here are the other CO cities that made the Top 25 list—Ft. Collins at #17, CO Springs at #20, and Thornton at #25.