| Harrisburg to Octeville | 3,579.07 mi (5,759.96 km) |
| Harrisburg to Oignies | 3,749.79 mi (6,034.70 km) |
| Harrisburg to Oissel | 3,700.69 mi (5,955.69 km) |
| Harrisburg to Olivet | 3,774.17 mi (6,073.93 km) |
| Harrisburg to Ollioules | 4,088.35 mi (6,579.56 km) |
| Harrisburg to Olonne-sur-Mer | 3,650.83 mi (5,875.45 km) |
| Harrisburg to Oloron-Sainte-Marie | 3,796.01 mi (6,109.09 km) |
| Harrisburg to Onet Village | 3,905.23 mi (6,284.86 km) |
| Harrisburg to Onnaing | 3,776.52 mi (6,077.72 km) |
| Harrisburg to Orange | 4,010.36 mi (6,454.05 km) |
| Harrisburg to Orchies | 3,759.83 mi (6,050.86 km) |
| Harrisburg to Orleans | 3,773.47 mi (6,072.81 km) |
| Harrisburg to Orly | 3,770.96 mi (6,068.78 km) |
| Harrisburg to Ormesson-sur-Marne | 3,775.92 mi (6,076.76 km) |
| Harrisburg to Orsay | 3,763.59 mi (6,056.91 km) |
