Founded in May 1, 1805, Highland County is one of 88 counties in the state of Ohio. Historically, Highland County was formed from Ross, Adams, and Clermont Counties. The city of Hillsboro is the county seat. With FIPS code of 71, Highland County has a population of 43,354 and area of 553.28 square miles (1,433 km2).
List of all cities in Highland County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Allensburg, OH | 45133 | 937 |
| Belfast, OH | 45133 | 937 |
| Buford, OH | 45110 | 937 |
| Clinton County, OH | 45135 | 937 |
| East Danville, OH | 45133 | 937 |
| East Monroe, OH | 45135 | 937 |
| Fairfax, OH | 45133 | 937 |
| Fayette County, OH | 45135 | 937 |
| Greenfield, OH | 45123 | 937 |
| Highland, OH | 45132 | 937 |
| Highland County, OH | 45135 | 937 |
| Hillsboro, OH | 45133 | 937 |
| Leesburg, OH | 45135 | 937 |
| Lynchburg, OH | 45142 | 937 |
| Mowrystown, OH | 45155 | 937 |
| New Market, OH | 45133 | 937 |
| North Uniontown, OH | 45133 | 937 |
| Rainsboro, OH | 45123 | 937 |
| Ross County, OH | 45123 | 937 |
| Samantha, OH | 45135 | 937 |
| Sinking Springs, OH | 45172 | 937 |
| Sugar Tree Ridge, OH | 45133 | 937 |
| Willetsville, OH | 45133 | 937 |