Location of Gainesville, Virginia
|- Total||10.3 sq mi (26.6 km2)|
|- Land||9.7 sq mi (25.2 km2)|
|– Water||0.6 sq mi (1.5 km2)|
|Elevation||354 ft (108 m)|
|- Density||450.9/sq mi (174.1/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|- Summer (DST)||EDT (UTC-4)|
|Area code(s)||703, 571|
|GNIS feature ID||1494951[2|
Gainesville is a census-designated place (CDP) in Prince William County, Virginia, United States. The population was 12,614 in the 2007 census.
As of the census of 2000, there were 4,382 people, 1,719 households, and 1,304 families residing in the CDP. The population density was 450.9 people per square mile (174.1/km²). There were 1,842 housing units at an average density of 189.6/sq mi (73.2/km²). The racial makeup of the CDP was 88.77% White, 6.80% African American, 0.23% Native American, 1.37% Asian, 0.05% Pacific Islander, 1.53% from other races, and 1.26% from two or more races. Hispanic or Latino of any race were 3.77% of the population.
There were 1,719 households out of which 32.8% had children under the age of 18 living with them, 67.2% were married couples living together, 5.6% had a female householder with no husband present, and 24.1% were non-families. 18.6% of all households were made up of individuals and 3.8% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 2.91.
In the CDP the population was spread out with 24.4% under the age of 18, 5.2% from 18 to 24, 36.7% from 25 to 44, 23.6% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 97.4 males. For every 100 females age 18 and over, there were 94.8 males.
The median income for a household in the CDP was $76,300, and the median income for a family was $82,627. Males had a median income of $46,934 versus $40,385 for females. The per capita income for the CDP was $35,196. About 1.9% of families and 2.8% of the population were below the poverty line, including 3.7% of those under age 18 and 0.6% of those age 65 or over.