slipped to #4 in the national population rankings Census Bureau ^ Census Bureau ^ slipped to #4 in the national population rankings slipped to #4 in the national population rankings US Census Bureau Florida has become the 3rd most populous State in U.S. Census Bureau ^ Census Bureau ^ increased by 0.75% US Census Bureau Florida has become the 3rd most populous State in U.S. Florida has become the 3rd most populous State in U.S.