According to the US Census Bureau, California has the largest population of any state in the United States, with an estimated 39.51 million residents as of July 1, 2020. Texas is second with a population of 29 million, and Florida is third with 21.48 million people. Other states rounding out the top ten most populous are New York (with 19.45 million people), Pennsylvania (12.8 million), Illinois (12.67 million), Ohio (11.7 million), Georgia (10.62 million), North Carolina (10.49 million) and Michigan (9.96 million). These ten states together make up over half the population of the United States, equating to approximately 152.7 million people.
The least populous state in the US is Wyoming, with a population of 578,759 as of July 1 2020. Following close behind are Vermont (623,989) and District of Columbia (709,045). Other states at the bottom of the list include North Dakota (761,062), Alaska (727,951), South Dakota (882,235), Delaware (967,171), Montana (1.075 million), Rhode Island (1.08 million) and Maine (1.344 million). Collectively, these states equate to approximately 10.44 million people, or 3% of the total US population.