How many billionaires are in the US?

Answer 1

As of 2016, there are 540 billionaires in the US (out of 1,810 in the world).

Here are the top 50, according to Business Insider:

1. Bill Gates
2. Warren Buffett
3. Jeff Bezos
4. David Koch
5. Charles Koch
6. Larry Ellison
7. Mark Zuckerberg
8. Michael Bloomberg
9. Larry Page
10. Sergey Brin
11. Jim Walton
12. Rob Walton
13. Alice Walton
14. Forrest Mars, Jr.
15. Jacqueline Mars
16. John Mars
17. Steve Ballmer
18. Phil Knight
19. Sheldon Adelson
20. George Soros
21. Michael Dell
22. Carl Icahn
23. Paul Allen
24. Donald Bren
25. Len Blavatnik
26. Ray Dalio
27. Charles Ergen
28. Laurene Powell Jobs
29. James Simons