The Jefferson Valley section of The Town of Yorktown is well recognized as a great shopping area due to the popularity of the Jefferson Valley Mall.

As of the census of 2000, there were 14,891 people, 5,420 households, and 4,151 families residing in the CDP. The population density was 2,154.2 per square mile (832.0/km²). There were 5,526 housing units at an average density of 799.4/sq mi (308.8/km²). The racial makeup of the CDP was 92.31% White, 2.33% African American, 0.11% Native American, 3.22% Asian, 0.01% Pacific Islander, 1.06% from other races, and 0.96% from two or more races. Hispanic or Latino of any race were 4.69% of the population.

There were 5,420 households out of which 38.0% had children under the age of 18 living with them, 68.8% were married couples living together, 6.3% had a female householder with no husband present, and 23.4% were non-families. 21.4% of all households were made up of individuals and 14.7% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.22.

In the CDP the population was spread out with 26.6% under the age of 18, 4.8% from 18 to 24, 26.7% from 25 to 44, 25.1% from 45 to 64, and 16.7% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 89.4 males. For every 100 females age 18 and over, there were 85.1 males.

The median income for a household in the CDP was $82,379, and the median income for a family was $96,089. Males had a median income of $65,585 versus $46,373 for females. The per capita income for the CDP was $34,347. About 1.4% of families and 2.5% of the population were below the poverty line, including 3.1% of those under age 18 and 4.3% of those age 65 or over

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