
Sea Cliff
- County:
- Nassau County
- County Seat:
- No
- Area (mi²):
- 1.115
- State:
- New York
Sea Cliff is a village located in Nassau County, New York. Sea Cliff has a 2025 population of 4,951. Sea Cliff is currently declining at a rate of -0.44% annually and its population has decreased by -2.15% since the most recent census, which recorded a population of 5,060 in 2020.
The average household income in Sea Cliff is $276,255 with a poverty rate of 1.56%. The median age in Sea Cliff is 41.3 years: 47.2 years for males, and 37.9 years for females.