Founded in Mar 1, 1808, Knox County is one of 88 counties in the state of Ohio. Historically, Knox County was formed from Fairfield County. The city of Mount Vernon is the county seat. With FIPS code of 83, Knox County has a population of 62,897 and area of 527.12 square miles (1,365 km2).
List of all cities in Knox County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Bladensburg, OH | 43005 | 740 |
| Brinkhaven, OH | 43006 | 740 |
| Centerburg, OH | 43011 | 740 |
| Danville, OH | 43014 | 740 |
| Fredericktown, OH | 43019 | 740 |
| Fredricktwn, OH | 43019 | 740 |
| Gambier, OH | 43022 | 740 |
| Howard, OH | 43028 | 740 |
| Martinsburg, OH | 43037 | 740 |
| Mount Liberty, OH | 43048 | 740 |
| Mount Vernon, OH | 43050 | 740 |