
Monte Rio
- County:
- Sonoma County
- County Seat:
- No
- Area (mi²):
- 1.905
- State:
- California
Monte Rio is a CDP located in Sonoma County, California. Monte Rio has a 2025 population of 676. Monte Rio is currently declining at a rate of -4.52% annually and its population has decreased by -33.92% since the most recent census, which recorded a population of 1,023 in 2020.
The average household income in Monte Rio is $98,531 with a poverty rate of 16.6%. The median age in Monte Rio is 63.4 years: 63.5 years for males, and 61.8 years for females.