| Zip Code : | 20169 |
| City : | Bull Run Mountain Estates, Gainesville, Haymarket town |
| County : | Prince William County |
| State : | Virginia (VA) |
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| Land Area : | 32.23 sq mi |
| Water Area : | 0.21 sq mi |
| Latitude : | 38.8791655 |
| Longitude : | -77.6454485 |
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| Population (2010): | 19,801 |
| Population Estimate (2012) : | 19,702 |
| Population Density : | 614.36/sq mi |
| Housing Units (2012) : | 6,746 |
| Median Household Income (2012) : | $133,675 (Virginia : $63,636, USA : $53,046) |
| Median Family Income (2012) : | $144,437 (Virginia : $76,566, USA : $64,585) |
| Median House Price (2012) : | $481,900 (Virginia : $249,700, USA : $181,400) |