See U.S. State Populations 2019: Most populous states U.S. State Populations 2018: Most populous states Release date: December 19, 2018 Washington, D.C., reached a population of 702,455 in July 2018, surpassing 700,000 for the first time since 1975 U.S. Census Bureau Release Date: December 19, 2018 DEC. 19, 2018 — The U.S. population grew by … Continue reading U.S. State Populations 2018: Most populous states