City Summary- The United States of America is the world’s third largest country in size and nearly the third largest in terms of population. Located in North America, the country is bordered on the west by the Pacific Ocean and to the east by the Atlantic Ocean. Along the northern border is Canada and the southern border is Mexico. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands and 326 Indian reservations. Click for More!