Placentia
- County:
- Orange County
- County Seat:
- No
- Area (mi²):
- 6.732
- State:
- California
Placentia is a city located in Orange County, California. Placentia has a 2026 population of 53,395. Placentia is currently growing at a rate of 0.29% annually and its population has increased by 1.38% since the most recent census, which recorded a population of 52,666 in 2020.