According to the United States Census Bureau, the Greentree CDP had a total area of 4.666 square miles (12.08 km2), including 4.659 square miles (12.07 km2) of land and 0.007 square miles (0.018 km2) of water (0.16%).[10][11]
The 2010 United States census counted 11,367 people, 4,007 households, and 3,218 families in the CDP. The population density was 2,439.8 people per square mile (942.0 people/km2). There were 4,134 housing units at an average density of 887.3 units per square mile (342.6 units/km2). The racial makeup was 73.52% (8,357) White, 6.54% (743) Black or African American, 0.08% (9) Native American, 17.34% (1,971) Asian, 0.00% (0) Pacific Islander, 0.65% (74) from other races, and 1.87% (213) from two or more races. Hispanic or Latino of any race were 3.04% (345) of the population.[9]
Of the 4,007 households, 37.8% had children under the age of 18; 67.0% were married couples living together; 10.0% had a female householder with no husband present and 19.7% were non-families. Of all households, 17.2% were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size was 3.21.[9]
25.9% of the population were under the age of 18, 6.4% from 18 to 24, 21.8% from 25 to 44, 31.3% from 45 to 64, and 14.5% who were 65 years of age or older. The median age was 42.2 years. For every 100 females, the population had 93.2 males. For every 100 females ages 18 and older there were 91.1 males.[9]
2000 census
As of the 2000 United States Census[4] there were 11,536 people, 3,883 households, and 3,253 families living in the CDP. The population density was 953.8 people/km2 (2,470 people/sq mi). There were 4,009 housing units at an average density of 331.5 units/km2 (859 units/sq mi). The racial makeup of the CDP was 77.51% White, 6.05% African American, 0.07% Native American, 14.82% Asian, 0.02% Pacific Islander, 0.55% from other races, and 0.98% from two or more races. Hispanic or Latino of any race were 2.05% of the population.[12]
There were 3,883 households, out of which 41.3% had children under the age of 18 living with them, 73.6% were married couples living together, 8.0% had a female householder with no husband present, and 16.2% were non-families. 13.8% of all households were made up of individuals, and 5.6% had someone living alone who was 65 years of age or older. The average household size was 2.94 and the average family size was 3.25.[12]
In the CDP the population was spread out, with 27.4% under the age of 18, 5.8% from 18 to 24, 26.2% from 25 to 44, 29.7% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 94.6 males. For every 100 females age 18 and over, there were 90.6 males.[12]
The median income for a household in the CDP was $85,816, and the median income for a family was $94,635. Males had a median income of $67,738 versus $39,896 for females. The per capita income for the CDP was $34,371. About 1.0% of families and 2.2% of the population were below the poverty line, including 1.7% of those under age 18 and 2.4% of those age 65 or over.[12]