
Marlboro
- County:
- Columbiana County
- County Seat:
- No
- Area (mi²):
- 0.43
- State:
- Ohio
Marlboro is a CDP located in Columbiana County, Ohio. Marlboro has a 2025 population of 304. Marlboro is currently growing at a rate of 7.04% annually and its population has increased by 2.7% since the most recent census, which recorded a population of 296 in 2020.
The average household income in Marlboro is $91,330 with a poverty rate of 3.32%. The median age in Marlboro is 63.2 years: 51.9 years for males, and 63.6 years for females.