Sussex County is the northernmost county in the U.S. state of New Jersey. Its county seat is Newton. It is part of the New York metropolitan area and is part of New Jersey's Skylands Region. As of the 2020 census, the county was the state's 17th-most-populous county, with a population of 144,221, a decrease of 5,044 (−3.4%) from the 2010 census count of 149,265, which in turn reflected an increase of 5,099 (+3.5%) over the 144,166 persons at the 2000 census. Based on 2020 census data, Vernon Township was the county's largest in both population and area, with a population of 22,358 and covering an area of 70.59 square miles (182.8 km2).
Ringwood Manor, located in Passaic County, New Jersey, was the site of an ironworks and home to a number of well-known ironmasters from the 1740s to the late 19th century. The current manor house was not built until 1807.
Papakating Creek is a 20.1-mile-long (32.3 km) tributary of the Wallkill River located in Frankford and Wantage townships in Sussex County, New Jersey in the United States. The creek rises in a small swamp located beneath the eastern face of Kittatinny Mountain in Frankford and its waters join the Wallkill to the east of Sussex borough.
Pahaquarry Township is a now-defunct township that was located in Warren County, New Jersey, United States, from 1824 until it was dissolved in 1997.
Oxford Furnace is a historic blast furnace on Washington Avenue, near the intersection with Belvidere Avenue, in Oxford, Oxford Township, Warren County, New Jersey. The furnace was built by Jonathan Robeson in 1741 and produced its first pig iron in 1743. The first practical use in the United States of hot blast furnace technology took place here in 1834. The furnace was added to the National Register of Historic Places on July 6, 1977 for its significance in industry during the 19th century. It was later added as a contributing property to the Oxford Industrial Historic District on August 27, 1992.
Millville is a defunct settlement in Jo Daviess County, Illinois, United States, located within the boundaries of Apple River Canyon State Park. Founded in 1835 and platted in 1846, the community was washed away completely by a flood in 1892. No visible remnants of its structures remain today. The site of Millville was added to the U.S. National Register of Historic Places as the Millville Town Site in 2003.
The Douglass House is a historic house currently located at the corner of Front and Montgomery Streets in the Mill Hill neighborhood of the city Trenton in Mercer County, New Jersey. It served as George Washington's headquarters prior to the Battle of Princeton on January 3, 1777. Listed as the Bright–Douglass House, it was documented by the Historic American Buildings Survey in 1936, when the house was located in Mahlon Stacy Park near the Delaware River. It was added to the National Register of Historic Places on December 18, 1970, for its significance in architecture, military and social history. It was added as a contributing property to the Mill Hill Historic District on December 12, 1977.
The Nathan Cooper Gristmill is a historic gristmill on the Black River located at 66 NJ Route 24 in Chester Township, Morris County, New Jersey. It was added to the National Register of Historic Places on November 21, 1976 for its significance in industry.
Van Campen's Inn or Isaac Van Campen Inn is a fieldstone residence that was used as a yaugh house during the American colonial era. Located in Walpack Township, Sussex County, New Jersey along the Delaware River, it is a historic site located along the Old Mine Road in the Delaware Water Gap National Recreation Area. It is operated under a memorandum of understanding between the National Park Service and the Walpack Historical Society, a local non-profit corporation.
Readingsburg, also known as Stone Mill, is an unincorporated community located along the South Branch Raritan River within Clinton Township in Hunterdon County, New Jersey.
Flatbrookville is an unincorporated community located along Old Mine Road within Walpack Township, in Sussex County, in the U.S. state of New Jersey. It is named after the Flat Brook, a tributary of the Delaware River, which flows through the community. The area is now part of the Delaware Water Gap National Recreation Area.
Millbrook, also known as Millbrook Village, is an unincorporated community located along Old Mine Road within Hardwick Township, formerly Pahaquarry Township, in Warren County, in the U.S. state of New Jersey. It is named after the Mill Brook, now known as Van Campens Mill Brook, a tributary of the Delaware River. The area is now part of the Delaware Water Gap National Recreation Area.
The Kingston Mill Historic District is a 49-acre (20 ha) historic district in Kingston, New Jersey. It is roughly bounded by the Millstone, River, and Princeton-Kingston Roads in the townships of Princeton in Mercer County, South Brunswick in Middlesex County, and Franklin in Somerset County. It was added to the National Register of Historic Places on April 10, 1986 for its significance in engineering, exploration/settlement, industry, and transportation. The district includes 16 contributing buildings and 2 contributing structures.
The Asbury Historic District is a 288 acres (117 ha) historic district encompassing the community of Asbury in Franklin Township of Warren County, New Jersey. It is bounded by County Route 632, County Route 643, Maple Avenue, Kitchen Road, and School Street and extends along the Musconetcong River into Bethlehem Township of Hunterdon County. It was listed on the National Register of Historic Places on March 19, 1993 for its significance in architecture, industry, religion, community development, politics/government, and commerce. The district includes 141 contributing buildings, a contributing structure, two contributing sites, and four contributing objects.
The Old Mine Road Historic District is a 687-acre (278 ha) historic district located along Old Mine Road in Sussex County and Warren County, New Jersey. It is part of the Delaware Water Gap National Recreation Area. The district was added to the National Register of Historic Places on December 3, 1980, for its significance in agriculture, archaeology, architecture, commerce, exploration/settlement, and transportation. It includes 24 contributing buildings and five contributing sites.
Middle Valley is an unincorporated community located along Middle Valley Road and County Route 513 in Washington Township, Morris County, New Jersey. It is located near Long Valley within the valley of the South Branch Raritan River. The Middle Valley Historic District was listed on the state and national registers of historic places in 1989 and 1990.
Bevans, also known as Peters Valley, is an unincorporated community located at the intersection of Bevans Road, Walpack Road, and Kuhn Road in Sandyston Township of Sussex County, New Jersey. The village is now part of the Delaware Water Gap National Recreation Area. Both the Delaware River and the Old Mine Road are nearby.
The Foster–Armstrong House is a historic house museum located at 320 River Road in Montague Township of Sussex County, New Jersey. It was documented by the Historic American Buildings Survey in 1970. It was added to the National Register of Historic Places on July 23, 1979, for its significance in agriculture, architecture, commerce, and exploration/settlement. The house is now part of the Delaware Water Gap National Recreation Area. The museum is managed by the Montague Association for the Restoration of Community History.
Franklin Corners is an unincorporated community located along the Passaic River at the intersection of County Route 613 and U.S. Route 202 in Bernards Township of Somerset County, New Jersey. In the 19th century, it had a grist mill, saw mill, general store, school, and several houses. The Franklin Corners Historic District, featuring Van Dorn's Mill, was listed on the National Register of Historic Places in 1975.
The Kline Farmhouse, also known as Cold Spring Cottage, is located on a 12-acre (4.9 ha) farm along County Route 517, north of Oldwick in Tewksbury Township of Hunterdon County, New Jersey. Built by Jacob Kline in the 1790s, it was added to the National Register of Historic Places on July 11, 1984, for its significance in agriculture, architecture and settlement. Also known as the Beavers House, it was previously documented by the Historic American Buildings Survey in 1966. It was later listed as a contributing property of the Oldwick Historic District in 1988.
United States 
New Jersey 
