How big is the US?

By population, the US is the 3rd largest nation in the world with a population of 298,444,215. Right behind China and India. By area, the US is the 3rd largest nation in the world with 3,537,437 square miles (9,161,923 square km). Right behind Russia and China. World Almanac & Book of Facts 2007
The United States is 9,826,675 km2 (3,794,101 square miles) and has an estimated population of 313,500,000 to date. It is the third largest country both in terms of area and population. It is slightly smaller than Canada and slightly larger than China.