Source: Except for the state map, which is real-time data, billionaires data is from the annual Forbes Billionaires List reports starting in 1990.
The most recent annual report is March 18, 2020. Source tables are available here.

Growth in Total Wealth of U.S. Billionaires During the Pandemic

The total wealth of U.S. billionaires grew by $845 billion during the roughly first six months of the coronavirus pandemic -- a 29% spike in wealth. This increase in wealth is about equal to the $845 billion being spent on Medicare in 2020, which serves more than 62 million people.

The U.S. added more than 29 more billionaires during this period, increasing from 614 to 643. During this time the economy cratered:
over 50 million people lost their jobs, 6.6 million fell ill with the virus and about 200,000 died from COVID-19.

In March 2020, Total Wealth of U.S. Billionaires

The total wealth of U.S. billionaires grew from $240 billion in 1990 (adjusted for inflation) to $2.95 trillion in March 2020.

U.S. billionaires’ total wealth in March 2020 was 12 times more than their total wealth in 1990.

While billionaires’ total wealth fell by 6% (-$98 billion) from 2000 to 2010 as a result of the Great Recession, it shot up by 85% ($1.36 trillion) from 2010 to March 2020.

In March 2020, Total Number of U.S. Billionaires

The number of U.S. billionaires grew more than nine fold between 1990 and March 2020 -- leaping from 66 to 614.

The combined wealth of the top three billionaires grew more than 11 times over that same period -- jumping from $23.8 billion (adjusted for inflation) in 1990 to $279 billion today.

Real-Time Wealth of U.S. Billionaires by State
March, 2020
In June 2020, Wealth of U.S. Billionaires Far Exceeds Wealth of Bottom 50% of Americans

In June 2020, U.S. billionaires had twice as much combined wealth than the bottom half of Americans -- $3.53 trillion vs. $2.1 trillion.

Even in the midst of a pandemic recession that’s rocked financial markets, just 614 billionaires have more wealth than the bottom half of Americans -- at least 165 million people in 61 million households.

In March 2020, U.S. Billionaires by Industry

Select year:

From 2010 to March 2020, more U.S. billionaires derived their wealth from finance and investments than any other industry. The financial sector boasted 104 billionaires in 2010 -- ten years later the number had grown to 160.

The technology industry produced the greatest growth in billionaires over the decade, more than doubling from 42 to 103.

In March 2020, U.S. Billionaires by Gender

In March 2020, there were more than seven male billionaires for every female billionaire.

The gender disparity among billionaires shows that the economic inequality found between men and women up and down the economic ladder in the U.S persists even at the very top.

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