MONEY30 Richest Americans Of All Time24/7 Wall St. reviewed lists of the wealthiest people in American history, both those living and deceased, and converted their net worth in current U.S. dollars to determine the richest Americans of all time. Among them: Sergey Brin and Larry Page, pictured here, who co-founded Google.Ralph Orlowski / Getty Images30. Jim Walton (b.1948)• 2018 estimated net worth: $46.6 billion• Source of wealth: Walmart• Birthplace: Newport, ArkansasWalmartcorporate / Flickr29. John Insley Blair (1802-1899)• 2018 estimated net worth: $47.7 billion• Source of wealth: Railroads• Birthplace: Belvidere, New JerseyPublic Domain / Wikimedia Commons28. Cyrus H.K. Curtis (1850-1933)• 2018 estimated net worth: $48.3 billion• Source of wealth: Publishing• Birthplace: Portland, MaineBain / Library Of Congress / Wikimedia Commons27. Charles & David Koch (b.1935, b.1940)• 2018 estimated net worth: $52.0 billion• Source of wealth: Koch Industries, multiple industries• Birthplace: Wichita, KansasMatthew Stockman / Andrew Toth / Getty Images26. William Weightman (1813-1904)• 2018 estimated net worth: $52.7 billion• Source of wealth: Pharmaceuticals• Birthplace: Waltham, EnglandNew York Times / Wikimedia Commons25. James G. Fair (1831-1894)• 2018 estimated net worth: $53.8 billion• Source of wealth: Mining industry• Birthplace: Clogher, Northern IrelandMathew Brady / Library Of Congress / Wikimedia Commons24. Sergey Brin (b.1973)• 2018 estimated net worth: $54.0 billion• Source of wealth: Google• Birthplace: Moscow, RussiaJustin Sullivan / Getty Images23. Russell Sage (1816-1906)• 2018 estimated net worth: $54.5 billion• Source of wealth: Stock trading• Birthplace: Verona, New YorkPirie MacDonald / Library Of Congress / Wikimedia Commons22. Larry Page (b.1973)• 2018 estimated net worth: $55.2 billion• Source of wealth: Google• Birthplace: East Lansing, MichiganChris Hondros / Getty Images21. Moses Taylor (1806-1882)• 2018 estimated net worth: $55.4 billion• Source of wealth: Citibank• Birthplace: N/ACourtesy Of U.S. National Archives And Records Administration Via Wikimedia Commons20. Michael Bloomberg (b.1942)• 2018 estimated net worth: $59.4 billion• Source of wealth: Bloomberg L.P.• Birthplace: Boston, MassachusettsAndrew Burton / Getty Images19. Andrew Mellon (1855-1937)• 2018 estimated net worth: $64.3 billion• Source of wealth: Banking• Birthplace: Pittsburgh, PennsylvaniaKeystone / Getty Images18. Larry Ellison (b.1944)• 2018 estimated net worth: $65.3 billion• Source of wealth: Oracle• Birthplace: New York City, New YorkKimberly White / Getty Images17. Mark Zuckerberg (b.1984)• 2018 estimated net worth: $66.0 billion• Source of wealth: Facebook• Birthplace: White Plains, New YorkChip Somodevilla / Getty Images16. Henry Ford (1863-1947)• 2018 estimated net worth: $68.3 billion• Source of wealth: Automobiles• Birthplace: Dearborn, MichiganGetty Images / Getty Images15. Marshall Field (1834-1906)• 2018 estimated net worth: $76.3 billion• Source of wealth: Department stores• Birthplace: Conway, MassachusettsPublic Domain / Wikimedia Commons14. Jay Gould (1836-1892)• 2018 estimated net worth: $79.6 billion• Source of wealth: Railroads• Birthplace: Roxbury, New YorkLibrary_of_congress / Flickr13. Warren Buffett (b.1930)• 2018 estimated net worth: $85.1 billion• Source of wealth: Berkshire Hathaway• Birthplace: Omaha, NebraskaChip Somodevilla / Getty Images12. Friedrich Weyerhaeuser (1834-1914)• 2018 estimated net worth: $92.7 billion• Source of wealth: Lumber• Birthplace: Saulheim, GermanyCourtesy Of George Grantham Bain Collection / Library Of Congress, Washington, D.C.11. Bill Gates (b.1955)• 2018 estimated net worth: $99.3 billion• Source of wealth: Microsoft• Birthplace: Seattle, WashingtonJack Taylor / Getty Images10. Alexander Turney Stewart (1803-1876)• 2018 estimated net worth: $101.7 billion• Source of wealth: Department stores• Birthplace: Lisburn, IrelandPublic Domain / Wikimedia Commons9. Andrew Carnegie (1835-1919)• 2018 estimated net worth: $102.7 billion• Source of wealth: Carnegie Steel Company• Birthplace: Dunfermline, ScotlandLibrary_of_congress / Flickr8. Stephen Van Rensselaer (1764-1839)• 2018 estimated net worth: $102.7 billion• Source of wealth: Inheritance, real estate• Birthplace: New York City, New YorkCourtesy Of National Portrait Gallery Via Wikimedia Commons7. Richard Mellon (1858-1933)• 2018 estimated net worth: $104.7 billion• Source of wealth: Banking• Birthplace: Pittsburgh, Pennsylvaniasecretary, while Richard remained in the private sector. ALSO READ: America’s Richest CitiesCourtesy Of National Photo Company Collection Via Wikimedia Commons6. Stephen Girard (1750-1831)• 2018 estimated net worth: $122.0 billion• Source of wealth: Shipping• Birthplace: Bordeaux, FrancePublic Domain / Wikimedia Commons5. John Jacob Astor (1763-1848)• 2018 estimated net worth: $140.3 billion• Source of wealth: Fur trading, real estate• Birthplace: Waldorf, GermanyNostri-imago / Flickr4. Jeff Bezos (b.1964)• 2018 estimated net worth: $151.6 billion• Source of wealth: Amazon• Birthplace: Albuquerque, New MexicoAlex Wong / Getty Images3. Sam Walton (1918-1992)• 2018 estimated net worth: $171.6 billion• Source of wealth: Walmart• Birthplace: Kingfisher, OklahomaPixelpackr / Flickr2. Cornelius Vanderbilt (1794-1877)• 2018 estimated net worth: $208.4 billion• Source of wealth: Shipping• Birthplace: Staten Island, New YorkNostri-imago / Flickr1. John D. Rockefeller (1839-1937)• 2018 estimated net worth: $257.3 billion• Source of wealth: Standard Oil• Birthplace: Richford, New YorkHulton Archive / Getty ImagesFeatured Weekly Ad