The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America. The third-largest country in the world by land and total area,[c] the U.S. consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands[i] and includes 326 Indian reservations. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with several other countries.[j] With a population of over 334 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.