Mercer County is a county located in the U.S. state of New Jersey. Its county seat is Trenton, also the state capital, prompting its nickname The Capital County. Mercer County alone constitutes the Trenton–Princeton metropolitan statistical area and is considered part of the New York metropolitan area by the U.S. Census Bureau, but also directly borders the Philadelphia metropolitan area and is included within the Federal Communications Commission's Philadelphia designated media market. As of the 2020 census, Mercer County's population was 387,340, retaining its position as the state's 12th-most populous county, an increase of 20,827 (5.7%) from the 2010 census when its population was 366,513. The county was formed by an act of the New Jersey Legislature on February 22, 1838, from portions of Burlington County, Hunterdon County, and Middlesex County,. The former Keith Line bisects the county and is the boundary between municipalities that previously had been separated into West Jersey and East Jersey.
Washington Crossing State Park is a 3,575-acre (14 km2) New Jersey state park that is part of Washington's Crossing, a U.S. National Historic Landmark area. It is located in the Washington Crossing and Titusville sections of Hopewell Township in Mercer County, north of Trenton along the Delaware River. The park is operated and maintained by the New Jersey Division of Parks and Forestry. It is supported by the Washington Crossing Park Association, a friends group that works to preserve, enhance, and advocate for the park.
Mill Hill is a historic neighborhood located within the city of Trenton in Mercer County, New Jersey, United States. It is considered to be part of Downtown Trenton. The Mill Hill Historic District was added to the National Register of Historic Places in 1977.
The New Jersey Register of Historic Places is the official list of historic resources of local, state, and national interest in the U.S. state of New Jersey. The program is administered by the New Jersey's state historic preservation office within the New Jersey Department of Environmental Protection.
The Old Barracks Museum, also known just as the Old Barracks, is a historic building located at 101 Barracks Street in Trenton, Mercer County, New Jersey. Built in 1758 to house soldiers of the British Army, it is the only remaining colonial barracks in the state and is one of the only tangible surviving elements of the 1776 Battle of Trenton. The building was added to the National Register of Historic Places on January 25, 1971 and listed as a National Historic Landmark on November 28, 1972, for its significance in military history. It is now a state-run historic site and museum.
The Princeton Battlefield in Princeton, Mercer County, New Jersey, United States, is where American and British troops fought each other on January 3, 1777 in the Battle of Princeton during the American Revolutionary War. The battle ended when the British soldiers in Nassau Hall surrendered. This success, following those at the Battle of Trenton on December 26, 1776 and the Battle of the Assunpink Creek the day before, helped improve American morale.
The William Trent House is a historic building located at 15 Market Street in Trenton, Mercer County, New Jersey. It was built in 1719 for William Trent and is the oldest building in Trenton. He founded the eponymous town, which became the capital of New Jersey. It has served as the residence for three Governors. The house was added to the National Register of Historic Places and listed as a National Historic Landmark on April 15, 1970, for its significance as an example of Early Georgian Colonial architecture.
The President's House, also known as the John Maclean House, or simply the Maclean House, in Princeton, Mercer County, New Jersey, United States, was built to serve as the home of the President of the College of New Jersey, which later became Princeton University. It was completed in 1756, the same year as Nassau Hall. United States Founding Father John Witherspoon lived here from 1768 through 1779, during which time he served as a delegate to the Continental Congress and signed the Declaration of Independence. George Washington occupied Maclean House in January 1777, during the Battle of Princeton and in 1783 while Congress met in Nassau Hall.
Penns Neck Baptist Church is a historic church located on US 1 at Washington Road in the Penns Neck section of West Windsor Township, Mercer County, New Jersey, United States. Built in 1812, the church was added to the National Register of Historic Places on December 28, 1989, for its significance in architecture, exploration/settlement, and religion.
Bow Hill is located in Hamilton Township, Mercer County, New Jersey, United States. The building was built in 1790 and added to the National Register of Historic Places on January 25, 1973.
The Old Eagle Tavern is a historic building located at 431, 433 South Broad Street at the corner of Ferry Street in Trenton, Mercer County, New Jersey. The building was built in 1765 by Robert Waln. The building operated as a tavern and hotel from 1765 to 1896. It was added to the National Register of Historic Places on November 3, 1972 for its architectural, commercial, and political significance. The building is also a contributing property of the Trenton Ferry Historic District, which was listed on June 26, 2013.
Gen. Philemon Dickinson House is located in Trenton, Mercer County, New Jersey, United States.
The Mercer Street Friends Center is located at 151 Mercer Street in the Mill Hill neighborhood of the city Trenton in Mercer County, New Jersey. Built in 1858, it was added to the National Register of Historic Places on August 12, 1971, for its significance in architecture, religion, and social history. It was added as a contributing property to the Mill Hill Historic District in 1977. It now houses the main offices of Mercer Street Friends, a Trenton-based Quaker-affiliated social service agency founded in 1958.
The Isaak Watson House is the headquarters of the New Jersey State Society of the National Society of the Daughters of the American Revolution (DAR). It is located just outside the state capital of Trenton in Hamilton Township, Mercer County, New Jersey. It is situated on a bluff overlooking Watson's Creek and the Abbott Farm National Historic Landmark in John A. Roebling Park, a 257-acre nature preserve.
The Kingston Mill Historic District is a 49-acre (20 ha) historic district in Kingston, New Jersey. It is roughly bounded by Herrontown, 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.
Tusculum is a country estate on Cherry Hill Road in Princeton, New Jersey, built in 1773 for John Witherspoon, president of Princeton University and signer of the Declaration of Independence. It is named after the Roman town of Tusculum, which was home to the country villa of Marcus Tullius Cicero. The property was often visited by George Washington and his wife, Martha, during Witherspoon's tenure as president of Princeton University. In 2013 the home was sold for $5.5 million.
The Jeremiah Woolsey House is a historic Dutch Colonial home located at 237 Washington Crossing–Pennington Road, southwest of Pennington, in Hopewell Township of Mercer County, New Jersey. Listed as the Jeremiah M. Woolsey House, it was documented by the Historic American Buildings Survey in 1936. The house was added to the National Register of Historic Places on January 27, 1975, for its significance in architecture and politics/government.
Middle Valley is an unincorporated community located along Middle Valley Road and County Route 513 in Washington Township, Morris County, New Jersey. It is near Long Valley in 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.
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 Timothy Mills House is a historic house built c. 1740 and located at 27 Mills Street in the town of Morristown in Morris County, New Jersey. It was documented by the Historic American Buildings Survey in 1939. It was added to the National Register of Historic Places on February 24, 1975, for its significance in architecture.
