|Location||3 mi. E of Hewitt, Ringwood Manor State Park, Ringwood, New Jersey|
|Area||724 acres (293 ha)|
|NRHP Reference #||66000471|
|Added to NRHP||November 13, 1966|
|Designated NHLD||November 13, 1966|
|Designated NJRHP||May 27, 1971|
Ringwood Manor was home to a number of well-known ironmasters from the 1740s to the late 19th century. During the American Revolutionary War, Robert Erskine managed ironmaking operations from Ringwood, Passaic County, New Jersey, United States, and became George Washington's first geographer and Surveyor General, producing maps for the Continental Army; Washington visited the Manor House several times. Ringwood iron was used in the Hudson River Chain, and for tools and hardware for the army. Martin J. Ryerson purchased the historic ironworks and began building the present Manor House in 1807 while still operating the iron mines and forges on the property. Ryerson ran five forge-furnace complexes in three counties from his headquarters at Ringwood for the next half century. Ryerson made shot for the War of 1812 and negotiated land and water rights with the Morris Canal Company for expansion of Long Pond (Greenwood Lake) and construction of the Pompton Feeder on the Morris Canal. The Ryerson Steel Company is still in operation today. New York's Peter Cooper, a remarkable inventor and industrialist and his young son-in-law, Abram S. Hewitt, purchased Ringwood in 1854. One of the Manor's last owners was Abram S. Hewitt, ironmaster, educator, lawyer, U.S. Congressman, and mayor of New York City.
A 479-acre (194 ha) area including the manor house was declared a National Historic Landmark District in 1966. The Ringwood Manor NHL area is the entire 479 acre Ringwood Manor State Park. One out building houses a working coal-fired, bellows-fed, forge. It was rebuilt in the 1960s and has briefly been operated by volunteer blacksmiths from time to time since.
- Ringwood State Park
- National Register of Historic Places listings in Passaic County, New Jersey
- List of museums in New Jersey
- "National Register Information System". National Register of Historic Places. National Park Service. 2009-03-13.
- "Ringwood Manor". National Historic Landmark summary listing. National Park Service. Retrieved 2007-10-14.
- Richard Greenwood (August 14, 1975). National Register of Historic Places Inventory-Nomination: Ringwood Manor / Ringwood Manor State Park. National Park Service and PDF
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