Find population milestones, the most populous countries and cities, population by decade and more. World Population Reaches 7 Billion World Population Milestones Total Population of the World by Decade, 1950-2050 Area and Population of Countries World's 50 Most Populous Countries: 2016 World's 50 Most Populous Countries: 2015 Population Density per Square Mile of Countries Most Populous Cities of the World World's Most Populous Urban Agglomerations World Statistics World Statistics Sources Our Common Sources
