| Official Name: | Loch Lomond, Virginia |
| Settlement Type: | Census-designated place (CDP) |
| Mapsize: | 260px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Virginia |
| Subdivision Type2: | County |
| Subdivision Name2: | Prince William |
| Unit Pref: | Imperial |
| Area Total Km2: | 1.9 |
| Area Land Km2: | 1.9 |
| Area Water Km2: | 0.0 |
| Area Total Sq Mi: | 0.7 |
| Area Land Sq Mi: | 0.7 |
| Area Water Sq Mi: | 0.0 |
| Population As Of: | 2010 |
| Population Total: | 3701 |
| Population Density Sq Mi: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 58 |
| Elevation Ft: | 190 |
| Coordinates: | 38.7806°N -77.4822°W |
| Blank Name: | FIPS code |
| Blank Info: | 51-46328[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1760938[2] |
Loch Lomond is a census-designated place (CDP) in Prince William County, Virginia, United States. The population was 3,701 at the 2010 census. It is named after a loch in northern Scotland, Loch Lomond.
Loch Lomond is located at 38.7806°N -77.4822°W (38.780614, -77.482188).[3]
According to the United States Census Bureau, the CDP has a total area of 0.7 square miles (1.9 km2), all of it land.
As of the census of 2000, there were 3,411 people, 1,048 households, and 865 families residing in the CDP. The population density was 4668.9sp=usNaNsp=us. There were 1,063 housing units at an average density of 1455sp=usNaNsp=us. The racial makeup of the CDP was 79.39% White, 7.01% African American, 0.26% Native American, 2.11% Asian, 0.06% Pacific Islander, 8.88% from other races, and 2.29% from two or more races. Hispanic or Latino of any race were 14.10% of the population.
There were 1,048 households, out of which 40.4% had children under the age of 18 living with them, 69.6% were married couples living together, 8.2% had a female householder with no husband present, and 17.4% were non-families. 13.1% of all households were made up of individuals, and 3.9% had someone living alone who was 65 years of age or older. The average household size was 3.25 and the average family size was 3.51.
In the CDP, the population was spread out, with 29.3% under the age of 18, 7.6% from 18 to 24, 31.5% from 25 to 44, 23.9% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 106.9 males. For every 100 females age 18 and over, there were 104.1 males.
The median income for a household in the CDP was $69,674, and the median income for a family was $70,970. Males had a median income of $40,177 versus $34,402 for females. The per capita income for the CDP was $21,604. About 6.2% of families and 7.3% of the population were below the poverty line, including 11.5% of those under age 18 and none of those age 65 or over.
The residents of Loch Lomond are represented in the Virginia House of Delegates by Danica Roem.