The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or informally as America, is a country primarily located in North America consisting of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands,[i] and 326 Indian reservations. It is the world's third-largest country by both land and total area.[c] It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations.[j] With a population of over 333 million,[k] it is the most populous country in the Americas and the third-most populous in the world. The national capital of the United States is Washington, D.C., and its most populous city and principal financial center is New York City.