As another answer says, William Randolph Hearst (1963-1951) had an estate of 250,000 acres at San Simeon in California.
On Phoebe Hearst's own death in 1919, Hearst inherited the ranch, which had grown to 250,000 acres (1,012 km2)[3] and 14 mi (23 km) of coastline,[25
https://en.wikipedia.org/wiki/Hearst_Castle#History
William Randolph Hearst also owned another vast California estate, Wyntoon.
William Randolph Hearst bought Wyntoon outright from its 99-year lease in 1929,[11] and in 1934 bought all of Wheeler Ranch and The Bend, a combined total of 50,000 acres (20,000 ha).[12]
https://en.wikipedia.org/wiki/Wyntoon
Hearst also owned The Beverly House at 1011 North Beverly Drive, Beverly Hills, CA, though today the estate has only 3.5 acres and probably never was very large.
https://www.forbes.com/sites/forbes-global-properties/2021/09/14/william-randolph-hearsts-grand-la-mansion-sells-at-auction-for-631-million/?sh=6badbf6559a7
Hearst also owned and largely rebuilt St Donat's Castle in Wales, though the estate was only 111 acres.
https://en.wikipedia.org/wiki/St_Donat%27s_Castle
George Washington Vanderbilt II (1862-1914) bought over 700 properties to form the Biltmore Estate of 125,000 acres or 195 square miles or 510 square kilometers, in near Ashville, North Carolina. His descendants still own Biltmore House, the largest house ever built in the USA, and 8,000 acres.
https://en.wikipedia.org/wiki/St_Donat%27s_Castle
This list
https://www.farmlandriches.com/largest-ranches-usa/ lists the 12 largest ranchs in the USA in 2023.
The smallest is the Howard Mesa Ranch in Arizona, with "only" 58,561 acres of land. The 10 largest ranches each have over 100,000 acres. The largest in the King Ranch in Texas, with 825,00 acres, larger than the state of Rhode Island. Many of those ranches should have ranch houses where the owners reside.
The island of Lanai in Hawaii has an area of 140.5 square miles or 364 square kilometers, or 89,920 acres. The entire island was the largest pineapple plantation in the world for decades. Larry Ellison of Oracle Corporation has owned 98 percent of Lanai, or about 88,121 acres. Ellison sometimes lives on Lanai, though I don't know how much of his part of the island counts as his estate.
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