The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, 326 Indian reservations, and nine minor outlying islands. It is the world's third-largest country by both land and total area. The United States shares land and maritime borders with Canada to the north and Mexico to the south as well as maritime borders with the Bahamas, Cuba, and Russia. With more than 331 million people, it is the third most populous country in the world. The national capital is Washington, D.C., and the most populous city and financial center is New York City.