Ketchum
- County:
- Blaine County
- County Seat:
- No
- Area (mi²):
- 3.207
- State:
- Idaho
Ketchum is a city located in Blaine County, Idaho. Ketchum has a 2026 population of 3,609. Ketchum is currently declining at a rate of -0.55% annually but its population has increased by 1.43% since the most recent census, which recorded a population of 3,558 in 2020.