Fountain Valley
- County:
- Orange County
- County Seat:
- No
- Area (mi²):
- 9.071
- State:
- California
Fountain Valley is a city located in Orange County, California. Fountain Valley has a 2026 population of 56,036. Fountain Valley is currently growing at a rate of 0.39% annually but its population has decreased by -1.64% since the most recent census, which recorded a population of 56,972 in 2020.