
San Jose
- County:
- Mason County
- County Seat:
- No
- Area (mi²):
- 0.414
- State:
- Illinois
San Jose is a village located in Mason County, Illinois. San Jose has a 2025 population of 449. San Jose is currently declining at a rate of -1.32% annually and its population has decreased by -6.07% since the most recent census, which recorded a population of 478 in 2020.
The average household income in San Jose is $72,718 with a poverty rate of 21.03%. The median age in San Jose is 34.1 years: 29.1 years for males, and 43 years for females.