Mill Neck is a village in Nassau County, New York, United States. The population was 997 at the 2010 census.
Mill Neck is located at 40°53′20″N 73°33′22″W (40.888890, -73.556080). The highest point of Mill Neck is Mill Hill.
According to the United States Census Bureau, the village has a total area of 2.9 square miles (7.5 km2), of which 2.6 square miles (6.7 km2) is land and 0.3 square miles (0.78 km2) (11.95%) is water.
As of the census of 2000, there were 825 people, 295 households, and 241 families residing in the village. The population density was 319.8 people per square mile (123.5/km2). There were 326 housing units at an average density of 126.4 per square mile (48.8/km2). The racial makeup of the village was 92.00% White, 0.24% African American, 4.73% Asian, 2.42% from other races, and 0.61% from two or more races. Hispanic or Latino of any race were 5.58% of the population.