Mather House Museum

Port Jefferson Village Historic District is a national historic district located at Port Jefferson in Suffolk County, New York. The district contains 98 contributing buildings. It includes a mix of residences, commercial buildings, and a church. The district is primarily residential dating from 1800 to 1915, with a majority built from the 1840s to 1870s in the Greek Revival and Italianate styles.It was added to the National Register of Historic Places in 2005.

First National Bank of Port Jefferson is a historic bank building located at Port Jefferson in Suffolk County, New York. It is a 2+1⁄2-story brick building with a 2-story turret that projects from the second story of the southwest corner and rises above the roof line. The turret has a steeply pitched, cone shaped slate roof and three windows on both levels. The main entrance to the building used to be directly below the turret, but was made into a window around 1949 when a 1-story brick, flat-roofed addition was built on the east side of the bank building. In 1948, the building ceased being used for a bank and was purchased by the Town of Brookhaven, who completed the 1-story addition the following year.The building was added to the National Register of Historic Places in 2005. In 2010, the building was owned by the Town of Brookhaven and used as their tax collector's office. In 2011, the Long Island Music Hall of Fame was slated to open inside the building, at the time only existing as a website. Brookhaven town officials announced an agreement for a 15-year lease at the site. The hall of fame never came to fruition.In 2013, a collectible ten-dollar bill issued by the First National Bank of Port Jefferson was put up for auction on EBay for about $5,000.The building was unoccupied for many years, until in 2016, the buildings interior was remodeled to include first floor retail space and two luxury residential apartments on the second floor. The retail space currently hosts the store Kate & Hale, which opened in 2017.

Port Jefferson, also known as Port Jeff, is an incorporated village in the town of Brookhaven in Suffolk County, New York, on the North Shore of Long Island. Officially known as the Incorporated Village of Port Jefferson, the population was 7,962 as of the 2020 United States census.Port Jefferson was first settled in the 17th century and remained a rural community until its development as an active shipbuilding center in the mid-19th century. The village has since transitioned to a tourist-based economy. The port remains active as terminus of the Bridgeport & Port Jefferson Ferry, one of two commercial ferry lines between Long Island and Connecticut, and is supplemented by the terminus of the Long Island Rail Road's Port Jefferson Branch. It is also the center of the Greater Port Jefferson region of northwestern Brookhaven, serving as the cultural, commercial and transportation hub of the neighboring Port Jefferson Station, Belle Terre, Mount Sinai, Miller Place, Poquott, and the Setaukets.

Bayles Shipyard is a historic shipyard located at Port Jefferson in Suffolk County, New York. It includes the 1897 Bayles Chandlery, the 1917 Machine Shop and Mould Loft and the 1917 Compressor House. The vicinity also contained a Mobil Oil Terminal. It was added to the National Register of Historic Places in 2000. The machine shop and mould loft is currently used as the Port Jefferson Village Center. The former Mobil Oil terminal was converted into the Jeanne Garant Harborfront Park in 2004.

Earl L. Vandermeulen High School, also referred to as Port Jefferson High School, is in the Port Jefferson School District, located in Port Jefferson, New York.

Lawrence Aviation Industries, Inc. (Lawrence Aviation) was an aircraft parts manufacturer that made titanium parts for military aircraft, such as the Grumman F-14 fighter jet. The former owner of the company, Gerald Cohen, was sentenced to one year and a day in prison and ordered to pay $105,816 in restitution for illegally storing more than 12 tons of hazardous waste on the company's grounds. The former site of the company, in the hamlet of Port Jefferson Station, Town of Brookhaven, New York, is one of the most contaminated sites on Long Island and may be responsible for a toxic groundwater plume in the region. The site is bounded by the Long Island Railroad tracks and Sheep Pasture Road to the north. A Long Island Power Authority easement runs along the southern edge of the property, separating the site from a residential area. To the east and west are residential areas.

Port Jefferson Power Station is a fossil-burning power plant in Port Jefferson, New York on Long Island. It is operated by National Grid USA. Its four main steam turbine units were constructed between 1948 and 1960 by the Long Island Lighting Company (LILCO), with the older two decommissioned in 1994.

Mather Hospital (formerly known as John T. Mather Memorial Hospital) is a general teaching hospital operated by Northwell Health, located in Port Jefferson, New York. It is named after John T. Mather (1854-1928), who, in 1916, made provisions to his will to create the hospital.

Belle Terre is a village in the Town of Brookhaven in Suffolk County, on the North Shore of Long Island, in New York, United States. The population was 792 at the 2010 census.

Port Jefferson is the terminus for the Port Jefferson Branch of the Long Island Rail Road in Port Jefferson Station, New York. The station is located on New York State Route 25A (Main Street), on the north side of the tracks, but is also accessible from Oakland Avenue, as well as Railroad Avenue and Union Street on the south side of the tracks. All service is diesel-only, and most off-peak trains are shuttles requiring a transfer to an electric train at Huntington. The station also serves Suffolk County Transit buses and occasionally the Village of Port Jefferson's own local jitney buses. One Suffolk County Transit bus, (Route S51) leads to the Bridgeport & Port Jefferson Ferry, approximately one mile to the north. It features service to Bridgeport, Connecticut, hence the reason for some station name signs being adjacent to "Bridgeport Ferries" signs.

Poquott is a village in Suffolk County, New York, United States. The population was 953 at the 2010 census. The village is located in the Town of Brookhaven, on the North Shore of Long Island, and is officially known as the Incorporated Village of Poquott.

Port Jefferson Station is a hamlet and census-designated place (CDP) in the Town of Brookhaven, in Suffolk County, in New York, United States. The population was 7,838 as of the 2010 census.