Donnelly
- County:
- Valley County
- County Seat:
- No
- Area (mi²):
- 0.714
- State:
- Idaho
Donnelly is a city located in Valley County, Idaho. Donnelly has a 2026 population of 255. Donnelly is currently declining at a rate of -0.39% annually but its population has increased by 1.59% since the most recent census, which recorded a population of 251 in 2020.
The median age in Donnelly is 53.4 years: 53.4 years for males, and 54.3 years for females. For every 100 females there are 195.5 males.