Herndon
- County:
- Fairfax County
- County Seat:
- No
- Area (mi²):
- 4.286
- State:
- Virginia
Herndon is a town located in Fairfax County, Virginia. Herndon has a 2026 population of 25,180. Herndon is currently growing at a rate of 0.55% annually and its population has increased by 2.41% since the most recent census, which recorded a population of 24,588 in 2020.