The Incorporated Village of Sea Cliff is a village located within the Town of Oyster Bay in Nassau County, New York. According to the United States 2010 Census, the village population was 4,995. The village is part of the North Shore School District.
Notable residents include poet, journalist and editor William Cullen Bryant, inventor and entrepreneur LaMarcus Adna Thompson (who established Sea Cliff's Thompson Park residential development), poet and journalist Alfred Lansing, author of Endurance: Shackleton's Incredible Voyage, Pulitzer Prize–winning short story writer Robert Olen Butler, Pulitzer Prize–winning journalist Dan Fagin, actress Natalie Portman, Emmy-award-winning comedian Kate McKinnon, John Rzeznik, frontman of the rock band Goo Goo Dolls, cartoonist Arnold Levin, Robert Ehrlich, founder of Pirate's Booty and Vegan Robs snack brands, Tim "The Tan Man" Ayers, R&B musician Mac Ayres, and Rose Elizabeth Bird, first female Chief Justice of California.
Sea Cliff is located at 40°50′47″N 73°38′40″W.
According to the United States Census Bureau, the village has a total area of 2.0 square miles (5.2 km2), of which, 1.1 square miles (2.8 km2) of it is land and 0.9 square miles (2.3 km2) of it (44.67%) is water.
As of the 2010 census the population was 92.8% White, 88% Non-Hispanic white, 2.4% African American, 0.1% Native American, 1.9% Asian, 0.02% Pacific Islander, 0.95% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 6.8% of the population.
At the 2000 census there were 5,066 people, 2,013 households, and 1,356 families in the village. The population density was 4,655.1 people per square mile (1,794.5/km2). There were 2,082 housing units at an average density of 1,913.1 per square mile (737.5/km2).