Osago
- County:
- Nelson County
- County Seat:
- No
- Area (mi²):
- 35.398
- State:
- North Dakota
Osago is located in Nelson County, North Dakota. Osago has a 2025 population of 41 . Osago is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 41 in 2020.
The median age in Osago is 14.5 years: 17.3 years for males, and 0 years for females. For every 100 females there are 116.7 males.