Green Oaks is a village in Libertyville Township, Lake County, Illinois, United States. Per the 2020 census, the population was 4,128.
According to the 2021 census gazetteer files, Green Oaks has a total area of , of which (or 97.44%) is land and (or 2.56%) is water.
As of the 2020 census there were 4,128 people, 1,457 households, and 996 families residing in the village. The population density was . There were 1,371 housing units at an average density of . The racial makeup of the village was 79.58% White, 1.02% African American, 0.07% Native American, 9.76% Asian, 0.10% Pacific Islander, 1.62% from other races, and 7.85% from two or more races. Hispanic or Latino of any race were 5.55% of the population.
There were 1,457 households, out of which 29.2% had children under the age of 18 living with them, 63.21% were married couples living together, 4.67% had a female householder with no husband present, and 31.64% were non-families. 30.47% of all households were made up of individuals, and 29.72% had someone living alone who was 65 years of age or older. The average household size was 3.25 and the average family size was 2.56.
The village's age distribution consisted of 22.6% under the age of 18, 7.5% from 18 to 24, 13.1% from 25 to 44, 33.3% from 45 to 64, and 23.6% who were 65 years of age or older. The median age was 50.3 years. For every 100 females, there were 114.5 males. For every 100 females age 18 and over, there were 110.1 males.
The median income for a household in the village was $119,625, and the median income for a family was $211,250. Males had a median income of $106,719 versus $53,398 for females. The per capita income for the village was $71,496. About 4.0% of families and 6.3% of the population were below the poverty line, including 0.6% of those under age 18 and 8.6% of those age 65 or over.