Three Texas cities are in America's top ten for the number of residents who are millionaires. The nation is home to more than 5½-million millionaires and nearly 800 billionaires. The United States Wealth Report says Houston is in fifth place with 90,900 millionaires, Dallas is sixth with 68,600, and Austin is number-ten with 32,700. Topping the list is New York City, with nearly 350,000 millionaires. The richest Texas resident is Tesla CEO Elon Musk.