Mill Neck
- County:
- Nassau County
- County Seat:
- No
- Area (mi²):
- 2.615
- State:
- New York
Mill Neck is a village located in Nassau County, New York. Mill Neck has a 2026 population of 1,008. Mill Neck is currently growing at a rate of 0.3% annually but its population has decreased by -1.08% since the most recent census, which recorded a population of 1,019 in 2020.