Kings Park West is a census-designated place in the eastern United States, in Fairfax County, Virginia, southwest of Washington, D.C. At the 2020 census the population was 13,465 people
The CDP is located in central Fairfax County, south of the city of Fairfax. It is bordered to the north by the George Mason CDP, to the northeast by Long Branch, to the southeast by Burke, and to the south by Fairfax Station. The CDP border follows Braddock Road on the north, Guinea Road on the southeast, Zion Drive on the southwest, and State Route 123 (Ox Road) on the west. Downtown Fairfax is to the north, and downtown Washington, D.C. is to the northeast.
According to the U.S Census Bureau, the Kings Park West CDP has a total area of , of which is land and , or 2.11%, is water.
Following the success of its Kings Park development earlier in the decade, Richmarr Construction Corporation started on Kings Park West. Construction began in mid-1967 and the first homes were available in 1968. The development was built in sections, with the final section completed in 1986.
Kings Park West includes Laurel Ridge Elementary School, dating from 1970. On the development's west boundary, Robinson Secondary School opened in 1971.
Kings Park West was first listed as a census designated place in the 2010 U.S. census.
At the 2020 census (some information from the 2022 American Community Survey) there were 13,465 people, 4,451 housing units and 4,284 households residing in the CDP. The population density was 4,429.3 inhabitants per square mile (1,710.9/km<sup>2</sup>). The average housing unit density was 1,464.1 per square mile (565.6/km<sup>2</sup>). The racial makeup of the CDP was 60.43% White, 5.00% African American, 0.33% Native American, 18.73% Asian, 0.07% Pacific Islander, 4.00% from other races, and 11.43% from two or more races. Hispanic or Latino of any race was 11.65% of the population.
Of the households, 67.8% were married couples, 9.7% were a male householder with no spouse, and 18.8% were a female householder with no spouse. The average family household had 3.25 people.
The median age was 40.9, 19.9% of people were under the age of 18, and 15.8% were 65 years of age or older. Of the residents the largest ancestry was the 16.7% had German ancestry, 29.8% spoke a language other than English at home, and 22.6% were born outside the United States, 68.6% of whom were naturalized citizens.
The median income for a household in the CDP was $162,176, and the median income for a family was $181,202. 10.4% of the population were military veterans, and 64.3% had a batchelors degree or higher. In the CDP 8% of the population was below the poverty line, including 3.7% of those under age 18% and 2.3 of those age 65 or over, with 4.6% of the population without health insurance.
The population as of the 2010 census was 13,390.