Hewlett Bay Park is a village in Nassau County, New York, United States, on the South Shore of Long Island. As of the United States 2010 Census, the village population was 404.
Hewlett Bay Park is located at 40°38′07″N 73°41′44″W / 40.635167°N 73.695654°W / 40.635167; -73.695654.
According to the United States Census Bureau, the village has a total area of 0.4 square miles (1.0 km), of which, 0.3 square miles (0.78 km) of it is land and 0.04 square miles (0.10 km) of it (5.41%) is water.
As of the census of 2000, there were 484 people, 157 households, and 138 families residing in the village. The population density was 1,381.6 people per square mile (533.9/km). There were 163 housing units at an average density of 465.3 per square mile (179.8/km). The racial makeup of the village was 91.32% White, 1.45% African American, 3.93% Asian, 1.86% from other races, and 1.45% from two or more races. Hispanic or Latino of any race were 4.75% of the population.
There were 157 households out of which 34.4% had children under the age of 18 living with them, 82.8% were married couples living together, 2.5% had a female householder with no husband present, and 11.5% were non-families. 8.9% of all households were made up of individuals and 5.7% had someone living alone who was 65 years of age or older. The average household size was 3.08 and the average family size was 3.23.
In the village, the population was spread out with 26.0% under the age of 18, 6.2% from 18 to 24, 19.0% from 25 to 44, 28.3% from 45 to 64, and 20.5% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 92.8 males. For every 100 females age 18 and over, there were 93.5 males.
The median income for a household in the village was in excess of $200,000, as is the median income for a family. Males had a median income of over $100,000 versus $43,333 for females. The per capita income for the village was $113,320. About 1.5% of families and 4.8% of the population were below the poverty line, including 11.0% of those under age 18 and none of those age 65 or over.