
Waldo
- County:
- Marion County
- County Seat:
- No
- Area (mi²):
- 0.648
- State:
- Ohio
Waldo is a village located in Marion County, Ohio. Waldo has a 2025 population of 312. Waldo is currently declining at a rate of -0.64% annually and its population has decreased by -2.8% since the most recent census, which recorded a population of 321 in 2020.
The average household income in Waldo is $81,787 with a poverty rate of 0.8%. The median age in Waldo is 29.1 years: 26.4 years for males, and 29.4 years for females.