1: For the first time, all 400 are billionaires

$1 million: Hourly earnings of casino mogul Sheldon Adelson over the past two years

89: Number of billionaires in California, the state with the most

0: Number of billionaires in Maine

91 percent: Tax rate for those in the highest federal income tax bracket in 1960

35 percent: Today’s high-bracket rate, the lowest in 70 years and a significant reason for the rapid growth of billionaires

Source: Washington Post.com