State and local ratio studies and property assessment

With about 4% of the world's population, the United States is the third most populous country (after India and China), and the most populous in the Americas and the Western Hemisphere. Its estimated population was 341,784,857 on July 1, 2025, according to the U.S. Census Bureau. The country's population grew by 1.8 million, or 0.5%, between 2024 and 2025, due to a decline in net international migration. The previous year, the Census Bureau had reported a population increase of 0.98% between 2023 and 2024, near the global population growth rate of 1.03%. These figures include the 50 states and the federal capital, Washington, D.C., but exclude the 3.6 million residents of five unincorporated U.S. territories (Puerto Rico, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands) as well as several minor uninhabited island possessions.