U.S. state Populations 2016: Most populous states Release date: December 20, 2016 See Update: U.S. state Populations 2017: Most populous states U.S. Census Bureau DEC. 20, 2016 — Utah’s population crossed the 3.0 million mark as it became the nation’s fastest-growing state over the last year. Its population increased 2.0 percent to 3.1 million from … Continue reading U.S. state Populations 2016: Most populous states -Release date: December 20, 2016