What are the opening hours?

Wednesday 9am - 5pm Thursday 9am - 5pm Friday 9am - 5pm Saturday 9am - 5pm Sunday 9am - 5pm

Dey Mansion Washington's Headquarters

About the Dey Mansion

The Dey Mansion, a superb example of Georgian architecture, achieved national recognition as General George Washington’s revolutionary war headquarters in the Preakness Valley. Constructed between 1740-1750 by Dirck Dey, a Dutch-born planter, the mansion is an amalgam of Dutch and English influences, a rich and dramatic composition of country and urban elements that had few

08/23/2024

The American and French armies moving in at least five separate columns pass through en route to Yorktown, Virginia. On August 22 and 25, American light infantry and artillery companies cross Acquackanonk Bridge and pass through present-day and .

08/21/2024

Washington passes through one last time as General of the Continental Army, probably pausing at . On November 2, he reads his farewell address to the army at Rocky Hill, New Jersey.

08/08/2024

07470. That's the answer!

Follow up question - what county was Dey Mansion originally located within?

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Photos from Dey Mansion Washington's Headquarters's post

08/07/2024

Back in 1780, Passaic County's map looked a little bit different. In fact, Passaic County didn't exist for more than 50 years after Dey Mansion was built.

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08/05/2024

We bring the walls of Dey Mansion to life, showcasing a part of American history you've never seen before. You don't have to travel far to indulge in our that is emboldened by our . Visit our mansion today and learn about Passaic County's pivotal role in the American Revolution.

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08/03/2024

Come check out some 18th century blacksmithing and woodworking at the Dey Mansion, today until 4:00 PM!

08/02/2024

Plan a visit and take in our at Dey Mansion. Let it empower your knowing all that happened in Passaic County during the American Revolution. We promise - you will not be disappointed.

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08/01/2024

If you haven't visited our gardens yet this summer, you're missing out! Come on by and see all the improvements we've made. They're beautiful and worth spending a summer afternoon in reflecting on the history and landscape.

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07/31/2024

There is still a full month to go before school starts. But that doesn't mean you can't get a jump on history lessons for the year.

Come visit us and take in a living history lesson on the American Revolution!

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07/29/2024

Safe Travels, Your Excellency! in 1780, George Washington departed Dey Mansion, ending his first stay here. He would head northeast to Connecticut to meet with Rochambeau and the French forces, who had landed earlier in July at Newport, Rhode Island. Washington would later return to Dey Mansion for a second stay in October of the same year. See you then, General Washington!

07/27/2024

When you travel to Dey Mansion, you can make a day of your excursion. Start with a tour in the morning, and then head out to lunch at one of our many local, Passaic County restaurants.

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07/26/2024

Of all the places you can travel... and all the places you can see... and all the knowledge you can learn...

Dey Mansion is ready to give you a glimpse into the past.

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07/25/2024

There is so much to explore and learn at Dey Mansion. Can't wait to see you this weekend!

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07/24/2024

07/24/2024

We dove deep into the history books for this one. If you got the answer correct, you're a Dey Mansion .

07/23/2024

We're going deep into the history archives with this one. Let's see who has been reading up on Dey Mansion.

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07/22/2024

Look around Dey Mansion. It's filled with . And we're close to home.

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07/19/2024

We're on the in Passaic County, celebrating our role in American Independence. You can join us on the tour and see all of the important locations across Passaic County. You can even win cool prizes by visiting all of the sites.

For the complete itinerary ➡️ https://bit.ly/43ha113

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07/17/2024

The new school year will be here in only a few short weeks. If you're a teacher looking for an exciting field trip close to school, then book with us at Dey Mansion. We can't wait to show your students a piece of local history.

For more details and curriculum suggestions ➡️ https://bit.ly/3xYaIBc

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07/17/2024

In the early days of New Jersey, Passaic County was not yet an independent county. Parts of our county were taken from Bergen County, which Theunis Det represented in the State Council.

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07/16/2024

Let's see who knows New Jersey history. (hint: look up the history of Passaic County to answer this correctly)

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07/15/2024

History. Happened. Here.

Come explore Dey Mansion and see why our location is an important part of how our nation came to be today.

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07/13/2024

Announcement: The Dey Mansion website www.deymansion.org is undergoing changes and will be down until next week. Please follow us on social media or call the main office for any information on tours, programs, etc. Thank you for your patience as we update our website.

07/12/2024

Dey Mansion is so much more than a historic location. Re-enactors regularly visit our mansion and bring the grounds to life. If you haven't been to one of these special days before, you are missing out. Don't worry! There will be plenty more later this year.

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07/11/2024

Make it a summer. Stop by our mansion for a tour and learn how important Passaic County was for our nation's history.

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07/10/2024

Every room has a story at Dey Mansion. Our guides can show you the beauty of our restored space, while sharing the history that put our region on the map. Make a plan to visit us and learn just how important our grounds were to the birth of our nation.

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07/10/2024

Did you get the answer right? The Dey family was prominent in the region dating back to 1641. Theunis Dey inherited the land where the mansion sits in 1764 and began constructing the home in 1772.

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07/09/2024

School might be out for summer vacation, but at Dey Mansion the learning never stops. How long has our mansion been revolutionary? Let's see if you know the answer.

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07/08/2024

When you visit our garden, there is plenty to do. A relaxing sanctuary nestled along the Preakness Valley Golf Course, you'll find a beautiful, natural space waiting for you. Come visit us and discover the magic of our garden.

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07/07/2024

We are excited to have living history demonstrations return to this summer. The forge is open again today until 4pm.

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Our Story

The Dey Mansion is open for tours Wednesdays through Sundays, from 10am to 4pm with the last tour starting at 4pm. Only cash and checks made payable to "County of Passaic" are accepted.

About the Dey Mansion

The Dey Mansion, a superb example of Georgian architecture, achieved national recognition as General George Washington’s revolutionary war headquarters in the Preakness Valley.
Constructed between 1740-1750 by Dirck Dey, a Dutch-born planter, the mansion is an amalgam of Dutch and English influences, a rich and dramatic composition of country and urban elements that had few mid-18th century counterparts west of the Hudson River. Dey, in all probability, left the completion of the mansion to his son, Theunis. During the Revolution, Theunis commanded the Bergen County Militia. Colonel Dey offered the easterly side of the house to General Washington when the commander-in-chief used it for his headquarters in July, October, and November of 1780.

Succeeding generations of the Dey Family resided in the house until 1801, when it was sold to a private owner. In 1930, the Passaic County Park Commission purchased the Dey Mansion, together with several barns and 55 acres of land. A plan of restoration was developed under the direction of Charles Cornelius who was a former Associate Curator of the Metropolitan Museum of Art and a recognized authority on early American architecture. The building was opened to the public on October 8, 1934. It is now managed by the Passaic County Department of Cultural and Historic Affairs. Located on a two-acre site, the grounds feature a formal garden and picnic area.