Founded in Mar 1, 1846, Mahoning County is one of 88 counties in the state of Ohio. Historically, Mahoning County was formed from Columbiana and Trumbull Counties. The city of Youngstown is the county seat. With FIPS code of 99, Mahoning County has a population of 226,762 and area of 415.25 square miles (1,075 km2).
List of all cities in Mahoning County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Austintown, OH | 44515 | 330/234 |
| Beloit, OH | 44609 | 330/234 |
| Berlin Center, OH | 44401 | 330/234 |
| Boardman, OH | 44512 | 330/234 |
| 44513 | 330/234 | |
| Campbell, OH | 44405 | 330/234 |
| Canfield, OH | 44406 | 330/234 |
| Coitsville, OH | 44436 | 330/234 |
| Cornersburg, OH | 44511 | 330/234 |
| Craig Beach, OH | 44429 | 330/234 |
| Damascus, OH | 44619 | 330/234 |
| Ellsworth, OH | 44416 | 330/234 |
| Greenford, OH | 44422 | 330/234 |
| Lake Milton, OH | 44429 | 330/234 |
| Lowellville, OH | 44436 | 330/234 |
| New Middletown, OH | 44442 | 330/234 |
| New Springfield, OH | 44443 | 330/234 |
| North Jackson, OH | 44451 | 330/234 |
| North Lima, OH | 44452 | 330/234 |
| Petersburg, OH | 44454 | 330/234 |
| Poland, OH | 44514 | 330/234 |
| Sebring, OH | 44672 | 330/234 |
| Struthers, OH | 44471 | 330/234 |
| Westville Lake, OH | 44609 | 330/234 |
| Youngstown, OH | 44501 | 330/234 |
| 44502 | 330/234 | |
| 44503 | 330/234 | |
| 44504 | 330/234 | |
| 44505 | 330/234 | |
| 44506 | 330/234 | |
| 44507 | 330/234 | |
| 44509 | 330/234 | |
| 44510 | 330/234 | |
| 44511 | 330/234 | |
| 44512 | 330/234 | |
| 44513 | 330/234 | |
| 44514 | 330/234 | |
| 44515 | 330/234 | |
| 44555 | 330/234 | |
| Youngstown State University, OH | 44555 | 330/234 |