Waldro
- County:
- Brule County
- County Seat:
- No
- Area (mi²):
- 36.769
- State:
- South Dakota
Waldro is located in Brule County, South Dakota. Waldro has a 2025 population of 73 . Waldro is currently declining at a rate of -1.35% annually but its population has increased by 1.39% since the most recent census, which recorded a population of 72 in 2020.
The median age in Waldro is 16.4 years: 13.5 years for males, and 37.5 years for females. For every 100 females there are 366.7 males.