The 2011 Billionaires List (25th annual Ranking) compiled by the Forbes Magazine has broken two records. First, the total number of listed billionaires (1,210) and the combined amount of their wealth ($4.5 trillion).

While the U.S. still continues to top the list with more than 490 billionaires, Asian billionaires pushed Europe back and are now second to the U.S.

One thing that is being reinforced by the 2011 ranking is the shift in global economic power with a sharp increase in the number of billionaires from the emerging BRIC economies. The number of billionaires from China almost doubled to 115, while with 101 and 30 representations respectively, Russia and Brazil saw a two-thirds jump. India had 55, which is six more than last year's representation.

With total net worth of $74 billion, Mexico's Carlos Slim topped the 2011 Forbes Billionaires List.

However, here's a list of the top 10 richest billionaires in the United States.

Start slideshow to view a gallery of the 10 richest billionaires in the U.S today.

Alice Walton
Alice Walton therichest.org
Jim Walton
Jim Walton therichest.org
David Koch
David Koch therichest.org
Charles Koch
Charles Koch therichest.org
Sheldon Adelson
Sheldon Adelson therichest.org
Christy Walton family
Christy Walton & family therichest.org
Larry Ellison
Larry Ellison REUTERS
Warren Buffet
Warren Buffet REUTERS
Bill Gates
Bill Gates REUTERS
Russia China India Russia