This is List of Ten Most Populated Countries in 2019. 10)MEXICO Mexico is a country between the U.S. and Central America that's known for its Pacific and Gulf of Mexico beaches and its diverse landscape of mountains, deserts and jungles. Ancient ruins such as Teotihuacán and the Mayan city of Chichén Itzá are scattered throughout the country, as are Spanish colonial-era towns. In capital Mexico City, upscale shops, renowned museums and gourmet restaurants cater to modern life. Approx. Population : 127,318,112 9)RUSSIA Russia, the world’s largest nation, borders European and Asian countries as well as the Pacific and Arctic oceans. Its landscape ranges from tundra and forests to subtropical beaches. It’s famous for Moscow's Bolshoi and St. Petersburg's Mariinsky ballet companies. St. Petersburg, founded by Russian leader Peter the Great, has the baroque Winter Palace, now housing part of the State Hermitage Museum’s art collection. Approx Popul...