Hartsdale is a hamlet and a census-designated place (CDP) located in the town of Greenburgh, Westchester County, New York. The population was 5,293 at the 2010 census. It is a suburb of New York City.
As of the census of 2000, there were 9,830 people, 4,314 households, and 2,756 families residing in the community. The population density was 3,068.0 per square mile (1,186.1/km²). There were 4,478 housing units at an average density of 1,397.6/sq mi (540.3/km²). The racial makeup of the community was 76.14% White, 8.71% African American, 0.19% Native American, 10.17% Asian, 0.04% Pacific Islander, 2.64% from other races, and 2.10% from two or more races. Hispanic or Latino of any race were 9.55% of the population.
There were 4,314 households out of which 24.3% had children under the age of 18 living with them, 53.1% were married couples living together, 8.6% had a female householder with no husband present, and 36.1% were non-families. 31.8% of all households were made up of individuals and 12.7% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 2.86.
In the CDP the population was spread out with 18.2% under the age of 18, 4.8% from 18 to 24, 30.3% from 25 to 44, 28.8% from 45 to 64, and 17.9% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 86.2 males. For every 100 females age 18 and over, there were 81.2 males.
The median income for a household in the community was $81,824, and the median income for a family was $100,330. Males had a median income of $62,362 versus $47,380 for females. The per capita income for the community was $45,691. About 1.6% of families and 2.6% of the population were below the poverty line, including 1.5% of those under age 18 and 4.6% of those age 65 or over.