East Northport is a hamlet and census-designated place (CDP) in the town of Huntington in Suffolk County, New York, United States.

The more populous settlement known as Larkfield was located on the northern side, near Vernon Valley (now part of Northport).

[4] The land between Larkfield and Clay Pitts was well suited for agriculture, and the region prospered in the late 18th century as a thriving farming community by supplying produce to markets in New York City and Brooklyn.

[5] However, just a few years later the LIRR decided to move the Northport station to a new location in Larkfield to facilitate further railway extension to Port Jefferson.

As Americans returned home from World War II, Long Island experienced a dramatic population shift from large cities to suburban areas.

East Northport's population soared as a housing boom transformed the rural farmland into modern suburbs.

On August 11, 1989, FBI Informant Robert Kubecka and his brother-in-law Donald Barstow were murdered inside their Brightside Avenue office by Lucchese Family soldiers Rocco Vitulli and Frank "Frankie the Pearl" Federico, on orders of Capo Salvatore Avellino, with the blessing of then-Lucchesse underboss Anthony 'Gaspipe' Casso.

[7] According to the United States Census Bureau, the CDP has a total area of 5.2 square miles (13.4 km2), all land.

Commack residents with East Northport postal addresses attend Commack School District and Elwood residents with East Northport postal addresses attend Elwood School District.