Tustin
- County:
- Orange County
- County Seat:
- No
- Area (mi²):
- 11.123
- State:
- California
Tustin is a city located in Orange County, California. Tustin has a 2026 population of 78,863. Tustin is currently growing at a rate of 0.61% annually but its population has decreased by -1.28% since the most recent census, which recorded a population of 79,885 in 2020.