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Alexi Morrison

Mansion Homes Content Director

First pubish date: December 12, 2015
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Largest Houses in the United States

We look at thousands of houses here at Mansion Homes and if one this is for certain – there are some really huge homes in the US. Let me start by saying the number one house on the list is 135,000 square feet! This list is of the largest homes in the United States, as stated on Wikipedia and verified by other mansions website. Many of these are historic homes, but there are some rather large new mega mansions also.

This is the largest list of the largest houses in the United States and this description is about to get even larger! These mega mansions are over 100,000 square feet! These mansion houses have been ranked officially by Wikipedia. These structures are still standing today and must not have been demolished. Some of these enormous homes have been turned into tourist attractions or museums but in order to qualify from this list, this has to be a mansion home or house at some point in history. We’ve also researched each of the largest houses in the United States to give you a short description about each one, the owners and what it does today.


Biltmore House: 135,000 square foot

The Biltimore house is officially the largest house in the United States. This tourist attraction and mega mansion in North Carolina, is actually a private residence that gives tours and things. There is significant history that goes along with the Biltimore house that can be found here on Mansion Homes.

Biltmore Estate

Address: 1 Lodge St, Asheville, NC 28803

Biltmore Estate - 18 pictures and address

This is the largest house in the United States. This luxury estate is a privately owned historic mansion and has 135,280 square feet of living area with 178,926 total floor space. Currently this house is used as a residence, attraction, bed and…


Oheka Castle: 100,000 square feet

The Oheka castle is currently a historic hotel with 32 guest rooms and suites on the upper floors of the mansion, a popular wedding venue for socialites, celebrities, and dignitaries, and the backdrop to many photo shoots and Hollywood films.

Oheka Castle

Address: 135 W Gate Dr, Huntington, NY 11743

Oheka Castle - 1 pictures and address

The name Oheka is an acronym of its original owner's name Otto Hermann Kahn, and Kahn also used the name for his yacht Oheka II and his ocean-front Villa 'Okeha' in Palm Beach, Florida. The castle is currently a historic…


Arden House: 90,000 square feet

The Arden House is a historic mega mansion in New Yorkwas once the personal resident of a railroad tycoon. The estate has changed hands a few times at auction, it was once a large conference hall but now is owned by a non profit.

Arden House

Address: Arden House Rd, Harriman, NY 10926

Arden House - 5 pictures and address

Arden house is one of the largest homes in the United States. It is almost 100,000 square feet. Arden was the estate owned by railroad magnate Edward Henry Harriman and Mary Averell Harriman outside Harriman, New York. On September 17,…

Value: $6,500,000 View all 5 photos


Winterthur Mansion: 90,000 square feet

Winterthur Mansion is a Delaware mega mansion and was the home of Henry Francis du Pont, a renowned antiques collector and horticulturist. It was built in 1880 and is almost 100,000 square foot, making it one of the largest houses in the United States.

Winterthur Mansion

Address: 5105 Kennett Pike (Route 52)
Winterthur, DE. 19735

Winterthur Mansion - 14 pictures and address

Winterthur Mansion was the home of Henry Francis du Pont, a renowned antiques collector and horticulturist. Henry Algernon du Pont designed Winterthur Mansion in the spirit of 18th- and 19th-century European Country Houses.  The younger du Pont added to the…

Shadow Lawn Mansion: 90,000 square foot

Shadow Lawn Mansion is a historic mega mansion in New Jersey, now known as Woodrow Wilson Hall, was built in 1929 at a high cost as the private residence of the F. W. Woolworth Co. president at the time, Hubert Templeton Parson and his wife. The mega mansion is now under the care of a university

Shadow Lawn Mansion

Address: 400 Cedar Avenue West Long Branch, NJ. 07764

Shadow Lawn Mansion - 20 pictures and address

Woodrow Wilson Hall, formerly known as the Shadow Lawn mansion, is one of the largest homes in the world and was built in 1929 at a cost of $10.5 million as the private residence of former F.W. Woolworth Co. president…



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