According to Wealth-X's 2019 Billionaire Census report, the United States has the most billionaires in the world, with 420 more than the next closest country, China. In fact, the combined net worth of US billionaires exceeds the total billionaire wealth of the next eight highest-ranked countries: China, Germany, Russia, United Kingdom, Switzerland, Hong Kong, India, and Saudi Arabia. These top 15 countries overall for billionaires, ranked below, account for 75 percent of the global billionaire population. Visit Business Insider's homepage for more stories.