Lake Grove is a village in Suffolk County, New York, United States. The population was 11,163 at the 2010 census. The village is located in the town of Brookhaven. The village is officially known as the Incorporated Village of Lake Grove.
Lake Grove is located at 40°51′30″N 73°7′0″W / 40.85833°N 73.11667°W / 40.85833; -73.11667. According to the United States Census Bureau, the village has a total area of 3.0 square miles (7.8 km), all of it land.
As of the census of 2000, there were 10,250 people, 3,419 households, and 2,742 families residing in the village. The population density was 3,436.8 people per square mile (1,328.0/km²). There were 3,509 housing units at an average density of 1,176.6 per square mile (454.6/km²). The racial makeup of the village was 91.31% White, 1.44% African American, 0.09% Native American, 4.93% Asian, 1.00% from other races, and 1.24% from two or more races. Hispanic or Latino of any race were 4.84% of the population.
There were 3,419 households out of which 38.7% had children under the age of 18 living with them, 66.8% were married couples living together, 9.5% had a female householder with no husband present, and 19.8% were non-families. 14.4% of all households were made up of individuals and 4.9% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.31.
In the village, the population was spread out with 26.3% under the age of 18, 7.3% from 18 to 24, 34.7% from 25 to 44, 22.7% from 45 to 64, and 9.0% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.1 males. For every 100 females age 18 and over, there were 94.3 males.
The median income for a household in the village was $67,174, and the median income for a family was $73,065. Males had a median income of $53,113 versus $33,253 for females. The per capita income for the village was $26,321. About 2.5% of families and 5.1% of the population were below the poverty line, including 6.8% of those under age 18 and 3.2% of those age 65 or over.