
Sun River
- County:
- Cascade County
- County Seat:
- No
- Area (mi²):
- 1.861
- State:
- Montana
Sun River is a CDP located in Cascade County, Montana. Sun River has a 2025 population of 42. Sun River is currently declining at a rate of -10.64% annually but its population has increased by 2.44% since the most recent census, which recorded a population of 41 in 2020.
The average household income in Sun River is $47,432 with a poverty rate of 0%. The median age in Sun River is 71.2 years: 71.6 years for males, and 69.5 years for females.