
Petersburg
- County:
- Mahoning County
- County Seat:
- No
- Area (mi²):
- 1.516
- State:
- Ohio
Petersburg is a CDP located in Mahoning County, Ohio. Petersburg has a 2025 population of 424. Petersburg is currently growing at a rate of 7.07% annually but its population has decreased by -10.17% since the most recent census, which recorded a population of 472 in 2020.
The average household income in Petersburg is $65,770 with a poverty rate of 41.58%. The median age in Petersburg is 27.9 years: 20.7 years for males, and 29.2 years for females.