The five most populated countries in the world as of July 2015 are China, India, the United States, Indonesia and Brazil. China has a population of 1,367,485,388 and India has a population of 1,251,695,584. These are the only countries in the world with populations over one billion.
China, India and Indonesia are located in Asia, the world's biggest and most populated continent. As a whole, Asia has a population of just over 3.8 billion. Pakistan, Russia and Japan, respectively the sixth, ninth and 10th most populated countries, are also located in Asia.
Nigeria is the most populated country in Africa with 183,523,432 people. Russia is the most populated country in Europe with a population of 142,098,141. The United States and Brazil are the most populous countries in North and South America, respectively, with populations of 325,127,634 and 203,657,210, and Australia is the most populous country in Oceania with a population of 23,923,101.
The five least populated nations in the world as of July 2015 are Tuvalu, Nauru, Palau, San Marino and Liechtenstein. Tuvalu and Nauru have populations of only 9,916 and 10,122, respectively. Both countries, along with Palau, are located in Oceania. San Marino and Liechtenstein, with populations of 31,802 and 37,461, are both in Europe. Liechtenstein is a tiny country between Switzerland and Austria, and San Marino is a sovereign nation located entirely inside of Italy.