7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 45133 | Hillsboro | 23,443 |
| 45123 | Greenfield | 8,740 |
| 45135 | Leesburg | 5,291 |
| 45142 | Lynchburg | 4,187 |
| 45155 | Mowrystown | 510 |
| 45172 | Sinking Spring | 308 |
| 45132 | Highland | 87 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Highland County, Ohio (US Census).