United States Population 2025 By State And City. United states of america has a population of 4.239% of the world's population. 51 rows by far the most populous state in the united states is california, which has more than 40 million residents and comprises nearly 12% of the.

The 2025 vote count is from the associated press in states. United states of america has a population of 4.239% of the world’s population.