| Place Name | Gainesville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 20155 |
| County | Prince William County |
| Area Code(s) | 571,703 |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 11,225 |
| Population Growth Rate (2010-19) | 57.76% |
| Majority Ethnicity | White 57.25% |
| Metro/Micro Stats Area | Washington-Arlington-Alexandria, DC-VA-MD-WV |
| US Congressional District(s) | Virginia 10thVirginia 1st |
| House of Delegates Districts | 13 |
| State Senate Districts | 13,28 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 57.25% |
| African American | 12.95% |
| Hispanic | 0.17% |
| Asian | 18.59% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 11.05% |