Dix Hills is an affluent hamlet and census-designated place (CDP) on Long Island in the town of Huntington in Suffolk County, New York, United States. The population was 26,892 at the 2010 census.
According to the United States Census Bureau, the CDP of Dix Hills has a total area of 15.9 square miles (41.3 km2), all of it land. The town of Huntington, of which Dix Hills is a part, has a total area of 137.1 square miles (355.1 km2), of which 94.1 square miles (243.8 km2) is land and 43.0 square miles (111.3 km2), or 31.35%, is water.
Dix Hills is located centrally on Long Island, on the south edge of Huntington, bordering the town of Babylon. The Long Island Expressway cuts almost straight through the middle of the hamlet.
Settlers traded goods with the indigenous Secatogue tribe for the land that became Dix Hills in 1699. The Secatogues lived in the northern portion of the region during the later half of that century. The land was known as Dick's Hills. By lore, the name traces to a local native named Dick Pechegan, likely of the Secatogues. Scholar William Wallace Tooker wrote that the addition of the English name "Dick" to the indigenous name "Pechegan" was a common practice.
Tooker wrote that Pechegan's wigwam and his planted fields became the hilly area's namesake, known as the shortened "Dix Hills" by 1911.