San Joaquin
- County:
- Fresno County
- County Seat:
- No
- Area (mi²):
- 1.197
- State:
- California
San Joaquin is a city located in Fresno County, California. San Joaquin has a 2026 population of 3,679. San Joaquin is currently declining at a rate of -0.3% annually and its population has decreased by -1.84% since the most recent census, which recorded a population of 3,748 in 2020.