Jefferson Valley-Yorktown is a census-designated place located in the town of Yorktown in Westchester County, New York, United States. The population was 14,142 at the 2010 census. It is a hot spot for local shoppers, due to its Jefferson Valley Mall.Jefferson Valley is located at 41°19′1″N 73°48′6″W / 41.31694°N 73.80167°W / 41.31694; -73.80167.According to the United States Census Bureau, the CDP has a total area of 7.0 square miles, of which 6.9 square miles is land and 0.1 square miles, or 1.14%, is water.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. There were 5,526 housing units at an average density of 799.4/sq mi. 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.