
Mad River
- County:
- Trinity County
- County Seat:
- No
- Area (mi²):
- 35.186
- State:
- California
Mad River is a CDP located in Trinity County, California. Mad River has a 2025 population of 297. Mad River is currently declining at a rate of -2.94% annually and its population has decreased by -12.9% since the most recent census, which recorded a population of 341 in 2020.
The average household income in Mad River is $51,951 with a poverty rate of 18.75%. The median age in Mad River is 40.8 years: 41.7 years for males, and 40.1 years for females.